in an unguarded moment
bijwoord
Roget 508: abruptly, unexpectedly, surprisingly; plump, pop, a l'improviste [Fr.], unawares; without notice, without warning, without a 'by your leave';" like a thief in the night, like a thunderbolt; in an unguarded moment; ... meer laten zien
Roget 460: negligently etc. adj.; hand over head, anyhow; in an unguarded moment etc. (unexpectedly) 508; per incuriam [Lat.].
Vind elders meer over in an unguarded moment: etymologie - rijmwoorden - Wikipedia.
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