INFANT Meaning of INFANT in English I. noun Synonyms: baby 1, babe, bantling, neonate, newbornII. adjective Synonyms: young 1, callow, green, immature, juvenile, unfledged, unripe, youthful Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003