not for a moment

Never, not in the least, as in Not for a moment did I believe he was telling the truth. This expression employs moment in the sense of “the tiniest length of time,” a usage dating from the mid-1300s.

Words nearby not for a moment

not circuit, not cricket, not done, not enough room to swing a cat, not feel oneself, not for a moment, not for all the tea in china, not for love or money, not gate, not give a damn, not give someone the time of day