a.
1.
Quick, swift, rapid, fleet, speedy, fast, brisk.
2.
Cursory, slight, hurried, rapid, superficial.
3.
Rash, precipitate, headlong, reckless, thoughtless, indiscreet.
4.
Passionate, irritable, touchy, testy, pettish, waspish, petulant, peevish, fretful, fiery, choleric, irascible, excitable, hot, peppery.