Synonyms of assurance in English:

assurance


See US English definition of assurance

See UK English definition of assurance

See Spanish definition of convicción

noun

1‘nothing could shake her calm assurance’

SYNONYMS
self-confidence, confidence, self-assurance, belief in oneself, faith in oneself, positiveness, assertiveness, self-possession, self-reliance, nerve, poise, aplomb, presence of mind, phlegm, level-headedness, cool-headedness
coolness, calmness, composure, collectedness, sangfroid, equilibrium, equanimity, imperturbability, impassivity, nonchalance, serenity, tranquillity, peace of mind
informal cool, unflappability
ANTONYMS

self-doubt, nervousness

2‘you have my assurance that I shall write to you’

SYNONYMS
word of honour, word, guarantee, promise, pledge, vow, avowal, oath, bond, affirmation, undertaking, commitment
archaic troth, parole

3‘there is no assurance of getting one's money back’

SYNONYMS
certainty, guarantee, sureness, certitude, confidence
hope, expectation
ANTONYMS

uncertainty

4‘they required him to take out life assurance’

SYNONYMS
insurance, indemnity, indemnification, protection, security, surety, cover, coverage
guarantee, safeguard, warranty, provision