/ Thesaurus / I Synonyms of infantile autism Find synonyms for: Noun1. infantile autism, autismusage: a rare but serious syndrome of childhood characterized by withdrawal and lack of social responsiveness or interest in others and serious linguistic deficits; "there is considerable dispute among specialists concerning infantile autism"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language