/ Thesaurus / S Synonyms of split infinitive Find synonyms for: Noun1. split infinitive, infinitiveusage: an infinitive with an adverb between `to' and the verb (e.g., `to boldly go')WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language