Noun

1. vermin, varmint, bad person

usage: an irritating or obnoxious person

2. vermin, pest

usage: any of various small animals or insects that are pests; e.g. cockroaches or rats; "cereals must be protected from mice and other vermin"; "he examined the child's head for vermin"; "boys in the village have probably been shooting vermin"

See also: vermin (Dictionary)