This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Lasting for only a moment.

adj. Occurring or present at every moment: in momentary fear of being exposed.

adj. Short-lived or ephemeral, as a life.

adj. Lasting for only a moment.

adj. Happening at every moment; perpetual.

adj. Ephemeral or relatively short-lived.

adj. Done in a moment; continuing only a moment; lasting a very short time.

Lasting but a moment or for a very short time; of short duration: as, a momentary pang.

Short-lived; likely to die soon or at any moment.

Occurring every moment: as, momentary interruptions.

adj. lasting for a markedly brief time

"Foley, who's openly gay, says he was molested by a priest as a child, leading him to addiction and what he calls a momentary lapse of judgment."

short   

momentarily    momentary god   

temporary    ephemeral   

sudden    temporary    inward    mental    profound    brief    fleeting    continual