A person or thing that disturbs, disquiets, or interferes with peace or quiet; one who causes tumult or disorder; a troubler.

One who or that which troubles (in any sense); a disturber; an oppressor.

One who troubles or disturbs.

An incendiary, a firebrand; one who kindles discontent and strife; also attributive.

A cause or source of harm or evil; spec. a person whose conduct or influence is harmful or mischievous. Now usually in weakened sense: a person…

One who breeds ‘bate’, or excites strife; a mischief-maker.

(also attributive)

‘a wild-headed person’ (Nares).

one who seeks sorrow, etc.

(attributive) that kindles strife or makes mischief.

one who stirs up or promotes strife (cf. blow, v.1 17b).

A person who makes mischief or trouble, esp. one who foments discord by gossiping, talebearing, etc. Cf. to make mischief at mischief, n. phrases 4…

a person who displays passion or great animation; cf. firebrand, n. 3.

slang (originally U.S.). An arsonist.

A disagreeable, disreputable, or contemptible person or (occasionally) thing, a ‘scumbag’; (also, Australian) a wayward or eccentric person, a crank.

= disturber, n. 1.

British slang. A troublemaker.