Impatience. Uneasiness, disquietude, restlessness; haste, vehemence, eagerness, precipitation, impetuosity; heat, violence of temper, irritability, irritableness.
Ant. Patience, calmness, endurance, composure, leniency, submission, forbearance, long-suffering.
Impediment. Bar, hindrance, obstacle, obstruction, difficulty, clog, encumbrance, stumbling-block, check.
Ant. Assistance, aid, benefit, help, relief, succor, advantage; aidance, support, furtherance.
Imperative. Commanding, authoritative, peremptory; binding, obligatory; urgent, irresistible, dictatorial, inexorable, compulsory.
Ant. Indulgent, lenient, supplicatory, mild, optional, discretional, entreative.
Imperial. Belonging to an empire, kingly, regal, sovereign, royal; majestic, grand, magnificent, exalted, great, noble, supreme, consummate, superb.
Ant. Ignoble, servile, slavish, beggarly, mean, paltry.
Imperious. Magisterial, dictatorial, despotic, domineering, tyrannical, overbearing, lordly, haughty, arrogant, authoritative, exacting.
Ant. Yielding, compliant, submissive, gentle, mild, docile, ductile.