1. (verb)guarantee, ensure, insure, assure, secure make certain of Synonyms: ensure, reassure, ascertain, batten, control, plug, stop up, warrant, batten down, assure, guarantee, underwrite, fix, cover, promise, fasten, check, see to it, undertake, procure, insure, tell, vouch, secure, see
2. (verb)assure, tell inform positively and with certainty and confidence Synonyms: tell apart, ensure, reassure, state, say, severalize, recount, control, narrate, promise, enjoin, check, guarantee, secern, differentiate, severalise, separate, recite, ascertain, assure, secernate, see to it, distinguish, insure, tell, order, evidence, secure, see
3. (verb)assure assure somebody of the truth of something with the intention of giving the listener confidence Synonyms: see, ascertain, see to it, promise, check, guarantee, ensure, insure, control, tell, secure, reassure
4. (verb)see, check, insure, see to it, ensure, control, ascertain, assure be careful or certain to do something; make certain of something Synonyms: guarantee, ensure, project, interpret, verify, look, experience, tick off, visualise, fit, gibe, assure, image, hold, run across, moderate, learn, checker, condition, mark off, run into, discover, escort, stop, examine, pick up, visit, reckon, consider, tally, come across, get a line, hold in, suss out, get wind, check off, check over, take care, match, check up on, control, look into, ascertain, mark, command, insure, attend, promise, date, realize, go over, train, check, hold back, underwrite, meet, go out, witness, manipulate, fancy, catch, construe, find out, see, discipline, tell, check into, regard, visualize, picture, find, go through, take in, correspond, curb, secure, view, keep in line, arrest, hear, cover, contain, operate, get word, envision, determine, figure, encounter, retard, crack, turn back, reassure, chequer, watch, see to it, break, understand, check out, master, go steady, tick, realise, jibe, agree, delay
5. (verb)reassure, assure cause to feel sure; give reassurance to Synonyms: see, ascertain, see to it, promise, check, guarantee, ensure, insure, assure, control, tell, secure, reassure
6. (verb)promise, assure make a promise or commitment Synonyms: predict, reassure, ascertain, control, promise, forebode, assure, guarantee, call, prognosticate, anticipate, check, see to it, foretell, insure, tell, ensure, secure, see
Synonyms, Thesaurus & Antonyms of 'assure'
English Synonyms and Antonyms
1. assure Confirm (L. con, together, and firmus, firm) is to add firmness or give stability to. Both confirm and corroborate presuppose something already existing to which the confirmation or corrobo Synonyms: confirm, assure, fix, sanction, substantiate, corroborate, prove, settle, sustain, establish, ratify, strengthen, uphold Antonyms: abrogate, cancel, overthrow, shatter, upset, annul, destroy, shake, unsettle, weaken, condole with, console
Synonyms for assure 
