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" Group Words Together by Emotional Tone Force Contrast Between Two Similar Words Uncover the Hidden Stories Behind GRE Words 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