n. 25B6; adjective
irregular features 007C; an irregular coastline : ASYMMETRICAL, non-uniform, uneven, crooked, misshapen, lopsided, twisted; jagged, ragged, serrated, indented.
irregular surfaces : ROUGH, bumpy, uneven, pitted, rutted; lumpy, knobbly, gnarled.
an irregular heartbeat : INCONSISTENT, unsteady, uneven, fitful, patchy, variable, varying, changeable, changing, inconstant, erratic, unstable, unsettled, spasmodic, intermittent, fluctuating.
irregular financial dealings : AGAINST THE RULES, out of order, improper, illegitimate, unscrupulous, unethical, unprofessional, unacceptable, beyond the pale; informal shady; Brit. informal not cricket; Austral./NZ informal over the fence.
an irregular army : GUERRILLA, underground; paramilitary; partisan, mercenary.
straight, smooth.
25B6; noun gun-toting irregulars : GUERRILLA, underground fighter; paramilitary; resistance fighter, partisan, mercenary.