1. 虱（子）
Lice are small insects that live on the bodies of people or animals and bite them in order to feed off their blood.
1. wingless usually flattened bloodsucking insect parasitic on warm-blooded animals
Synonym: sucking louse
2. wingless insect with mouth parts adapted for biting
mostly parasitic on birds
Synonym: bird lousebiting louse
3. any of several small insects especially aphids that feed by sucking the juices from plants
Synonym: plant louse
4. a person who has a nasty or unethical character undeserving of respect