GRE infantile Definition Childish or immature in behavior or thinking. Example "His infantile remarks ruined the serious discussion." Sign in to save GRE Quiz → ← infant infantry → Study tips featuring "infantile" Write GRE Words Into Your Own Sentences 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