suddenly

1 with great suddenness the bus stopped suddenly, and somebody's lunch landed in the aisle Synonyms abruptly, shortRelated Words surprisingly, unexpectedly; directly, immediately, incontinently, instantaneously, instantly, promptly, pronto, right, right away, right off, straightaway; fast, full-tilt, posthaste, quick, quickly, rapidly, readily, snappily, speedily, swift, swiftly; hastily, impetuously, impulsively, rashly, recklesslyNear Antonyms gradually, slowly; hesitantly

2 without warning suddenly, something fell out of the sky and landed in the field a few feet away Synonyms aback, unawares, unanticipatedly, unaware, unexpectedlyRelated Words abruptly, short; amazingly, astoundingly, surprisinglyNear Antonyms laggardly, leisurely, pokily, slowly, sluggishly, tardily; obviously