Princeton's WordNet

1. indifferent, so-so(p)(adverb)

   being neither good nor bad

   "an indifferent performance"; "a gifted painter but an indifferent actor"; "her work at the office is passable"; "a so-so golfer"; "feeling only so-so"; "prepared a tolerable dinner"; "a tolerable working knowledge of French"

2. acceptably, tolerably, so-so(adverb)

   in an acceptable (but not outstanding) manner

   "she plays tennis tolerably"

Kernerman English Learner's Dictionary

1. so-so(adjective)ˈoʊsˈoʊ

   not very good; = average

   "How do you feel today? "So-so. I'm still a little tired."

Wiktionary

1. so-so(Adverb)

   Neither very well nor very poorly.

   He performed so-so during the tryouts, and the coach was undecided whether to add him to the team or not.

2. so-so(Adjective)

   Neither good nor bad; tolerable, passable, indifferent.

   The dessert was pretty good, but the meal was so-so.

Webster Dictionary

1. So-so(adj)

   neither very good nor very bad; middling; passable; tolerable; indifferent

2. So-so(adverb)

   tolerably; passably

• so-soAfrikaans
• بَيْنَ بَيْنArabic
• горе-долуBulgarian
• meia bocaPortuguese (BR)
• tak takCzech
• so lalaGerman
• så som såDanish
• έτσι κι έτσιGreek
• así así, regular, de aquella maneraSpanish
• pole viga, on ja ei ole (kah)Estonian
• kohtalainenFinnish
• comme ci, commeçaFrench
• כָּכָה כָּכָהHebrew
• ना ज्यादा अच्छा ना ज्यादा खराबHindi
• tako takoCroatian
• nem valami jó(l)Hungarian
• sedang-sedang sajaIndonesian
• sæmilegur, svona og svonaIcelandic
• così cosìItalian
• まあまあのJapanese
• 그저 그렇게Korean
• šiaip sauLithuanian
• viduvējs; tā pa vidam; ne šis, ne tasLatvian
• boleh tahanMalay
• zo-zoDutch
• sånn passe, så som såNorwegian
• taki sobiePolish
• نه بد نه خوبPersian
• نه بد نه هم ښهPashto
• assim assimPortuguese
• aşa şi-aşaRomanian
• так себеRussian
• tak-takSlovak
• tako takoSlovenian
• tako takoSerbian
• sådär, någorlundaSwedish
• งั้น ๆThai
• şöyle böyleTurkish
• 馬馬虎虎Chinese (Trad.)
• поганенький, такий собіUkrainian
• معمولیUrdu
• tàm tạmVietnamese
• 一般的，马马虎虎Chinese (Simp.)