Synonyms of irregular in English:

irregular


See definition of irregular

adjective

1‘he had strong, irregular features’

SYNONYMS
asymmetrical, non-uniform, uneven, crooked, misshapen, lopsided, contorted, twisted
twisting, serpentine, curving
broken, jagged, ragged, craggy, serrated, sawtooth, saw-edged, notched, nicked, indented
ANTONYMS

regular, straight

2‘use sandpaper to smooth irregular surfaces’

SYNONYMS
rough, bumpy, uneven, coarse
pitted, rutted, rutty, holed, holey
lumpy, knobby, knobbly, gnarled
ANTONYMS

regular, smooth

3‘an irregular heartbeat’

SYNONYMS
inconsistent, unsteady, uneven, shaky, fitful, patchy, variable, varying, changeable, changing, ever-changing, on-and-off, off-and-on, inconstant, erratic, haphazard, unstable, unsettled, spasmodic, sporadic, episodic, intermittent, occasional, unpunctual, wavering, fluctuating, aperiodic, unsystematic, unmethodical, capricious
informal peaky
desultory, casual
ANTONYMS

regular, steady

4‘his appointment was most irregular’

SYNONYMS
against the rules, contrary to the rules, out of order, improper, incorrect, illegitimate, unscrupulous, unethical, unprofessional
unofficial, back-door, grey
not done, unacceptable, wrong, beyond the pale, unorthodox, unconventional, off-centre, abnormal
informal not on, a bit much, shady
British informal a bit thick, off, not cricket
Australian, New Zealand informal over the fence
ANTONYMS

above board

5‘an irregular army’

SYNONYMS
guerrilla, underground
unofficial, paramilitary
resistance, partisan, mercenary
ANTONYMS

regular


noun

1‘scruffy, gun-toting irregulars refused to allow traffic through the town’

SYNONYMS
guerrilla, underground fighter
paramilitary
resistance fighter, partisan, mercenary
ANTONYMS

regular