Chapter Ironbark tree to Irrejectable of I by Webster's Dictionary (1913 Edition)

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.

Mazes intricate,
Eccentric, intervolved, yet regular
Then most when most irregular they seem.

Milton.

Leading the men of Herefordshire to fight
Against the irregular and wild Glendower.

Shak.

A flowery meadow through which a clear stream murmured in many irregular meanders.

Jones.

Syn. — Immethodical; unsystematic; abnormal; unnatural; anomalous; erratic; devious; crooked; eccentric; unsettled; uneven; variable; changeable; mutable; desultory; disorderly; wild; immoderate; intemperate; inordinate; vicious.

Irregular
(Ir*reg"u*lar), n. One who is not regular; especially, a soldier not in regular service.

Irregularist
(Ir*reg"u*lar*ist), n. One who is irregular. Baxter.

Irregularity
(Ir*reg`u*lar"i*ty) n.; pl. Irregularities [Cf. F. irrégularité.] The state or quality of being irregular; that which is irregular.

Irregularly
(Ir*reg"u*lar*ly), adv. In an irregular manner.

Irregulate
(Ir*reg"u*late) v. t. To make irregular; to disorder. [Obs.] Sir T. Browne.

Irregulous
(Ir*reg"u*lous) a. Lawless. [Obs.] Shak.

Irrejectable
(Ir`re*ject"a*ble) a. That can not be rejected; irresistible. Boyle.