GRE TOEFL IELTS colossal Definition Extremely large in size, scale, or degree. Example "The discovery was a colossal breakthrough for modern medicine." Sign in to save GRE PDF — $25 TOEFL PDF — $25 IELTS PDF — $25 ← colony colt → Study tips featuring "colossal" Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant