Definition of impatient :
1. Not patient; not bearing with composure; intolerant; uneasy; fretful; restless, because of pain, delay, or opposition; eager for change, or for something expected; hasty; passionate; - often followed by at, for, of, and under.
2. Not to be borne; unendurable.
3. One who is impatient.
4. Prompted by, or exhibiting, impatience; as, impatient speeches or replies.
zealous, ardent, thirsty, enthusiastic, longing, intense, intolerant of, accept, animated, fed up, eager, bursting, upset, in the hope that/of, yearning, be dying for something/to do something, impatient of, hungry, intent, put out, angry, keen, importunate, restive, restless, thirsting, impetuous, avid, attitude, solicitous, desirous, annoyed, raring, intolerant, agog, belligerent, concern, earnest, in need of something, anxious, displeased, burning, hot, mad, calm, short, glowing, cross, vehement, athirst, unforbearing, fervent, irritated
hasty (part of speech: adjective)
irritable (part of speech: adjective)