1. The state of restlessness; the lack of serenity and calmness; an unwillingness to accept delays: Little Tommy was always disposed to impatience when he had to wait for his parents or when he had to wait for his dessert!
2. An inclination to be irritable or intolerant; failure to bear suffering, discomfort, annoyance, etc.: Barbara's impatience was showing because she was waiting for a very important letter in the mail.

Mr. Lawson's impatience was quite noticeable in the waiting room at the doctor's office because he had been waiting for at least an hour before it was his turn!