Synonyms of infallible in English:

infallible


See definition of infallible

adjective

1‘she had an infallible sense of timing’

SYNONYMS

unerring, error-free, unfailing, faultless, flawless, impeccable, perfect, true, uncanny, precise, accurate, meticulous, scrupulous

British informal spot on

North American informal on the money

2‘infallible cures for a variety of ailments’

SYNONYMS

unfailing, never failing, always effective, guaranteed, dependable, trustworthy, reliable, sure, certain, safe, sound, tried and tested, foolproof, effective, efficacious

informal sure-fire