1. (adj.)weak not strong; liable to give way under pressure or strain; fragile; frail.
2. weak lacking in bodily strength or healthy vigor, as from age or sickness; feeble; infirm.
3. weak lacking in force, potency, or efficacy; impotent, ineffectual, or inadequate: weak sunlight; a weak president.
4. weak lacking in rhetorical or creative force or effectiveness.
5. weak lacking in logical or legal force or soundness: a weak argument.
6. weak deficient in mental power, intelligence, or judgment.
7. weak not having much moral strength or force of character: to prove weak under temptation.
8. weak deficient in amount, volume, intensity, etc.; faint; slight: a weak electrical current; a weak pulse.
9. weak deficient, lacking, or poor in something specified: I'm weak in spelling.
10. weak deficient in the essential or usual properties or ingredients: weak tea.
11. weak unstressed, as a syllable, vowel, or word.
12. weak (of verbs in Germanic languages) forming the past tense and past participle by the addition of a suffix without change of the root vowel, as work, worked, or having a preterit ending in a dental, as bring, brought.
13. weak (of wheat or flour) having a low gluten content or having a poor quality of gluten.
14. weak characterized by a decline in prices: a weak stock market.
Etymology: (1250–1300; ME weik < ON veikr, c. OE wāc)
Definition of 'weak'
Princeton's WordNet
1. (adj)weak wanting in physical strength "a weak pillar"
3. (adj)unaccented, light, weak (used of vowels or syllables) pronounced with little or no stress "a syllable that ends in a short vowel is a light syllable"; "a weak stress on the second syllable"
4. (adj)fallible, frail, imperfect, weak wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings "I'm only a fallible human"; "frail humanity"
5. (adj)weak tending downward in price "a weak market for oil stocks"
6. (adj)weak deficient or lacking in some skill "he's weak in spelling"
7. (adj)decrepit, debile, feeble, infirm, rickety, sapless, weak, weakly lacking bodily or muscular strength or vitality "a feeble old woman"; "her body looked sapless"
8. (adj)weak (used of verbs) having standard (or regular) inflection
9. (adj)weak not having authority, political strength, or governing power "a weak president"
10. (adj)faint, weak deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc "a faint outline"; "the wan sun cast faint shadows"; "the faint light of a distant candle"; "weak colors"; "a faint hissing sound"; "a faint aroma"; "a weak pulse"
11. (adj)weak likely to fail under stress or pressure "the weak link in the chain"
12. (adj)weak deficient in intelligence or mental power "a weak mind"
1. (adjective)weak not physically strong or healthy My legs felt weak.; He seemed weaker and couldn't even sit up.
2. weak ≠ strong The beam was too weak to support the roof.
3. weak ≠ strong the weak economy; The dollar is weak against the Euro.
4. weak ≠ strong the defense's weak arguments
5. weak not having enough power, determination, or support from others a leader who is too weak to negotiate
6. weak difficult to see or hear a weak sound coming from the basement
7. weak ≠ strong students' weak math skills
8. weak ≠ strong a weak gin and tonic; a weak bleach solution
9. weak sb's weak spot/point the thing that can cause sb or sth to fail The police are trying to find the gang's weak spot.
Definition of 'weak'
Webster Dictionary
1. (adj)weak to make or become weak; to weaken
2. (verb)weak wanting physical strength
3. (verb)weak deficient in strength of body; feeble; infirm; sickly; debilitated; enfeebled; exhausted
4. (verb)weak not able to sustain a great weight, pressure, or strain; as, a weak timber; a weak rope
5. (verb)weak not firmly united or adhesive; easily broken or separated into pieces; not compact; as, a weak ship
6. (verb)weak not stiff; pliant; frail; soft; as, the weak stalk of a plant
7. (verb)weak not able to resist external force or onset; easily subdued or overcome; as, a weak barrier; as, a weak fortress
8. (verb)weak lacking force of utterance or sound; not sonorous; low; small; feeble; faint
9. (verb)weak not thoroughly or abundantly impregnated with the usual or required ingredients, or with stimulating and nourishing substances; of less than the usual strength; as, weak tea, broth, or liquor; a weak decoction or solution; a weak dose of medicine
10. (verb)weak lacking ability for an appropriate function or office; as, weak eyes; a weak stomach; a weak magistrate; a weak regiment, or army
11. (verb)weak not possessing or manifesting intellectual, logical, moral, or political strength, vigor, etc
12. (verb)weak feeble of mind; wanting discernment; lacking vigor; spiritless; as, a weak king or magistrate
13. (verb)weak resulting from, or indicating, lack of judgment, discernment, or firmness; unwise; hence, foolish
14. (verb)weak not having full confidence or conviction; not decided or confirmed; vacillating; wavering
15. (verb)weak not able to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable; as, weak resolutions; weak virtue
16. (verb)weak wanting in power to influence or bind; as, weak ties; a weak sense of honor of duty
17. (verb)weak not having power to convince; not supported by force of reason or truth; unsustained; as, a weak argument or case
18. (verb)weak wanting in point or vigor of expression; as, a weak sentence; a weak style
19. (verb)weak not prevalent or effective, or not felt to be prevalent; not potent; feeble
20. (verb)weak lacking in elements of political strength; not wielding or having authority or energy; deficient in the resources that are essential to a ruler or nation; as, a weak monarch; a weak government or state
21. (verb)weak tending towards lower prices; as, a weak market
22. (verb)weak pertaining to, or designating, a verb which forms its preterit (imperfect) and past participle by adding to the present the suffix -ed, -d, or the variant form -t; as in the verbs abash, abashed; abate, abated; deny, denied; feel, felt. See Strong, 19 (a)
23. (verb)weak pertaining to, or designating, a noun in Anglo-Saxon, etc., the stem of which ends in -n. See Strong, 19 (b)
Definitions of weak 
Afrikaans: swak
Arabic: ضَعيف الجِسِم
Bulgarian: слаб
Brazilian: fraco / débil
Czech: slabý
German: schwach
Danish: svag; slap
Greek: αδύναμος
Spanish: débil
Estonian: nõrk
Farsi: ضعف
Finnish: heikko
French: faible
Hebrew: חַלָש
Hindi: कमजोर
Croatian: slab
Hungarian: gyönge
Indonesian: lemah
Icelandic: máttlaus, veikburða
Italian: debole
Japanese: 弱い
Korean: (체력이) 약한
Lithuanian: silpnas
Latvian: vājš; nespēcīgs
Malay: lemah
Dutch: zwak
Norwegian: svak(elig), skrøpelig
Polish: słaby, słabowity
Portuguese: fraco
Romanian: slab
Russian: слабый
Slovak: slabý
Slovenian: šibek
Serbian: slab
Swedish: svag, klen, vek
Thai: อ่อนแอ
Turkish: zayıf, güçsüz
Taiwanese: 虛弱的
Ukrainian: слабкий, кволий
Urdu: کمزور
Vietnamese: yếu
Chinese: 虚弱的
