All regular antonyms

adj regular

• unusual — not usual, common, or ordinary; uncommon in amount or degree; exceptional: an unusual sound; an unusual hobby; an unusual response.
• unconventional — not conventional; not bound by or conforming to convention, rule, or precedent; free from conventionality: an unconventional artist; an unconventional use of material.
• abnormal — Someone or something that is abnormal is unusual, especially in a way that is worrying.
• special — of a distinct or particular kind or character: a special kind of key.
• atypical — Someone or something that is atypical is not typical of its kind.
• anomalous — Something that is anomalous is different from what is usual or expected.
• eccentric — deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd: eccentric conduct; an eccentric person.
• inconsistent — lacking in harmony between the different parts or elements; self-contradictory: an inconsistent story.
• infrequent — happening or occurring at long intervals or rarely: infrequent visits.
• unsteady — not steady or firm; unstable; shaky: an unsteady hand.
• variable — apt or liable to vary or change; changeable: variable weather; variable moods.
• untraditional — of or relating to tradition.
• different — not alike in character or quality; distinct in nature; dissimilar: The two brothers are very different, although they are identical twins.
• irregular — without symmetry, even shape, formal arrangement, etc.: an irregular pattern.
• uncommon — not common; unusual; rare: an uncommon word.
• rare — Réseaux Associés pour la Recherche Européenne
• disorderly — characterized by disorder; irregular; untidy; confused: a disorderly desk.
• unstable — not stable; not firm or firmly fixed; unsteady.
• untrustworthy — deserving of trust or confidence; dependable; reliable: The treasurer was not entirely trustworthy.
• uneven — not level or flat; rough; rugged: The wheels bumped and jolted over the uneven surface.
• unfair — not fair; not conforming to approved standards, as of justice, honesty, or ethics: an unfair law; an unfair wage policy.
• indefinite — not definite; without fixed or specified limit; unlimited: an indefinite number.
• disordered — lacking organization or in confusion; disarranged.
• weak — not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor.
• broken — Broken is the past participle of break.
• rough — having a coarse or uneven surface, as from projections, irregularities, or breaks; not smooth: rough, red hands; a rough road.