Irregular vs. Unregular — Which is Correct Spelling?

Contrary to rule, accepted order, or general practice

Not conforming to legality, moral law, or social convention

Not straight, uniform, or symmetrical

Of uneven rate, occurrence, or duration

Deviating from a type; atypical.

(Botany) Having differing floral parts, as of a zygomorphic or asymmetric flower.

Falling below the manufacturer's standard or usual specifications; imperfect.

(Grammar) Departing from the usual pattern of inflection, derivation, or word formation, as the present forms of the verb be or the plural noun children.

Not belonging to a permanent, organized military force

One, such as an item of merchandise, that is irregular.

A soldier, such as a guerrilla, who is not a member of a regular military force.

Nonstandard; not conforming to rules or expectations

Rough

Without symmetry, regularity, or uniformity

Not regular; having sides that are not equal or angles that are not equal

Whose faces are not all regular polygons (or are not equally inclined to each other)

Not following the regular or expected patterns of inflection in a given language

A soldier who is not a member of an official military force and who may not use regular army tactics.

One who does not regularly attend a venue.

Not regular; not conforming to a law, method, or usage recognized as the general rule; not according to common form; not conformable to nature, to the rules of moral rectitude, or to established principles; not normal; unnatural; immethodical; unsymmetrical; erratic; no straight; not uniform; as, an irregular line; an irregular figure; an irregular verse; an irregular physician; an irregular proceeding; irregular motion; irregular conduct, etc. Cf. Regular.

One who is not regular; especially, a soldier not in regular service.

A member of an irregular armed force that fights a stronger force by sabotage and harassment

Merchandise that has imperfections; usually sold at a reduced price without the brand name

Contrary to rule or accepted order or general practice;

(of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement

Not occurring at expected times

Used of the military; not belonging to or engaged in by regular army forces;

Deviating from what is usual or common or to be expected; often somewhat odd or strange;

Lacking continuity or regularity;

Of a surface; not level or flat;

Used of independent armed resistance forces;

Independent in behavior or thought;