TOEFL IELTS vast Definition Extremely large in size, extent, or degree; immense. Example "The vast desert stretched endlessly under the hot sun." Sign in to save TOEFL PDF — $25 IELTS PDF — $25 ← vassal vastness → Study tips featuring "vast" TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze