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.
without symmetry, regularity, or uniformity
rough
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)
nonstandard; not conforming to rules or expectations
not following the regular or expected patterns of inflection in a given language
Somebody who is recreant, who yields in combat; a coward or traitor.
Unfaithful to someone, or to one's duties or honour; disloyal, false.