n. 25B6; noun
her calm assurance : SELF-CONFIDENCE, confidence, self-assurance, self-possession, nerve, poise, aplomb, level-headedness; calmness, composure, sangfroid, equanimity; informal cool, unflappability.
you have my assurance : WORD (OF HONOUR), promise, pledge, vow, avowal, oath, bond, undertaking, guarantee, commitment.
there is no assurance of getting one's money back : GUARANTEE, certainty, certitude, surety, confidence, expectation.
life assurance : INSURANCE, indemnity, indemnification, protection, security, cover.
self-doubt, uncertainty.