TOEFL vigorous Definition Strong, active, and energetic in effort or movement. Example "He made a vigorous argument in favor of climate reform." Sign in to save TOEFL PDF — $25 ← vigor vile → Study tips featuring "vigorous" TOEFL Academic Vocabulary: Study by Topic 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