Abrupt, Advanced, Agile, Anxious, Bearish, Brash, Breakneck, Breathless, Brief, Brisk, Careless, Chafing, Combustible, Contentious, Cranky, Cursory, Dashing, Desperate, Eager, Edgy, Electrifying, Excited, Expeditious, Explosive, Express, Fast, Unanticipated, Uneasy, Unexpected, Unforeseen, Unmade, Unplanned, Unpredicted, Unpremeditated, Unprepared, Unquiet, Unready, Unripe, Unthinking, Untimely, Urgent, Volatile, Volcanic, Wanton, Waspish, Wild, Winged, Feverish, Fiery, Fleet, Fleeting, Flying, Forward, Fretful, Fretting, Furious, Galloping, Haphazard, Headlong, Heedless, Hot, Hotheaded, Hurried, Hustling, Immediate, Impatient, Impetuous, Impromptu, Improvised, Impulsive, Incautious, Inconsiderate, Instant, Instantaneous, Irascible, Irritable, Lively, Mad, Madcap, Makeshift, Mercurial, Momentary, Nimble, Overenthusiastic, Overhasty, Passing, Passionate, Peppery, Perfunctory, Petulant, Precipitate, Precipitous, Precocious, Premature, Previous, Prompt, Quick, Rapid, Rash, Reckless, Restive, Restless, Running, Rushed, Rushing, Shocking, Slapdash, Snap, Snappy, Spanking, Speedy, Splenetic, Spunky, Squirming, Startling, Sudden, Superficial, Surprised, Surprising, Swift, Testy, Thoughtless