Princeton's WordNet

1. enormousness, grandness, greatness, immenseness, immensity, sizeableness, vastness, wideness(noun)

   unusual largeness in size or extent or number

Wiktionary

1. vastness(Noun)

   The quality of being vast

2. vastness(Noun)

   Something vast

Webster Dictionary

1. Vastness(noun)

   the quality or state of being vast

• uitgestrektheidAfrikaans
• إتّساع، إمتِدادArabic
• ширBulgarian
• vastidãoPortuguese (BR)
• nesmírnostCzech
• die UnermeßlichkeitGerman
• umådelig størrelseDanish
• απεραντοσύνηGreek
• vastedad, inmensidadSpanish
• tohutu suurusEstonian
• عظمتFarsi
• suunnattomuusFinnish
• immensitéFrench
• מֶרחַבHebrew
• विस्तारHindi
• ogromnostCroatian
• végtelenség, mérhetetlenségHungarian
• ukuran besarIndonesian
• feiknastærð; víðáttaIcelandic
• vastità, enormitàItalian
• 巨大さJapanese
• 광대함Korean
• didumasLithuanian
• plašums; lielums; bezgalībaLatvian
• luas terbentangMalay
• immensiteitDutch
• uendelighet, vidstrakthetNorwegian
• ogromPolish
• vastidãoPortuguese
• vastitateRomanian
• огромностьRussian
• nesmiernosťSlovak
• ogromnostSlovenian
• ogromnostSerbian
• väldighet, ofantlighetSwedish
• ความใหญ่โตThai
• uçsuz bucaksız olmaTurkish
• 巨大，巨額Chinese (Trad.)
• численністьUkrainian
• وسعتUrdu
• rộng lớn, mênh môngVietnamese
• 巨大，大量Chinese (Simp.)