That occurs or manifests suddenly or in haste; (of an opinion, thought, etc.) hastily constructed; lacking due consideration; hasty, rash. Cf. subita…

That occurs or is manifested suddenly; rapid, sudden, hasty. Cf. subitaneous, adj. 1.

= subitaneous, adj. 1.

Moving rapidly or violently; causing rapid movement; abrupt, sudden. Obsolete.

That occurs or is manifested suddenly, spontaneously, or in haste; sudden, hasty, unexpected; (also) hastily produced or constructed; makeshift. Now…

= precipitate, adj. 4.

Acting, occurring, or moving at great speed; rapid, swift; sudden, abrupt.

Performed, occurring, or acting very rapidly; very sudden, abrupt; (Obstetrics) designating very rapid labour, typically resulting in delivery of…

Rapid; sudden, abrupt. Cf. precipitate, adj. 4.