TOEFL IELTS stiff Definition Rigid or not easily bent; severe or formal in manner. Example "After the workout, his muscles felt stiff and sore." Sign in to save TOEFL Quiz → IELTS Quiz → ← sticky stiffen → Study tips featuring "stiff" Audit Your Own Writing to Find Gaps TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL swiftness GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze