/ Thesaurus / H Synonyms of headfast Find synonyms for: Noun1. headfast, mooring, mooring lineusage: a mooring line that secures the bow of a boat or ship to a wharfWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language