hasty

Synonyms: abrupt agile brash breakneck brief brisk careless chop-chop cursory eager expeditious fast fiery fleet fleeting foolhardy harefooted headlong heedless hurried illadvised impatient impetuous impulsive incautious inconsiderate madcap on the double passing pdq perfunctory precipitate prompt pronto quick quickened quickie rapid rash reckless rushed short slambang slapdash snappy sudden superficial swift thoughtless urgent

Antonyms: delayed lazy lingering loitering slow