GRE TOEFL IELTS slumber Definition A state of sleep, especially deep sleep. Example "The baby lay in peaceful slumber, unaware of the noise outside." Sign in to save GRE Quiz → TOEFL Quiz → IELTS Quiz → ← slum slump → Study tips featuring "slumber" 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