without warning
adverb
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; ... show more
Moby thesaurus: abruptly, bang, by surprise, dash, hastily, impetuously, implausibly, improbably, impulsively, like a flash, like a thunderbolt, of a sudden, on short notice, plop, plump, plunk, pop, precipitantly, precipitately, precipitously ... show more.
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