GRE TOEFL IELTS dull Definition lacking interest or excitement; not sharp or bright. Example "The lecture was so dull that half the class fell asleep." Sign in to save GRE Quiz → TOEFL Quiz → IELTS Quiz → ← dulcet duly → Study tips featuring "dull" Audit Your Own Writing to Find Gaps Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct