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Definition of louse

louse

/laʊs/
louse

Plural:lice
•
Adjective:lousy
•
Past Simple:loused
•
Past Participle:loused
•
Present Participle:lousing
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louse Lexical Profile

louse Game Scores & Validity

• noun

1

A small, wingless, parasitic insect that lives on the skin of mammals and birds.

Example

"The children were sent home from school after a louse was found in a student's hair."


2

A contemptible, unpleasant, or unethical person.

Example

"She realized her former business partner was a louse who had been secretly embezzling from the company for years."

Synonyms
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Antonyms
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• verb

1

To spoil, ruin, or botch a situation or opportunity (typically used with 'up').

Example

"He managed to louse up the presentation by accidentally deleting the most important slides right before the meeting."


2

To remove lice from a person or animal.

Example

"The primatologist observed the monkeys as they would meticulously louse each other during their daily social grooming."

Synonyms
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Word Nuance & Usage

When referring to the insect, the plural form is strictly 'lice', but when referring to a contemptible person, the regular plural 'louses' is often used.

• Rhymes for louse

Word Origin & Etymology

From Middle English 'lous', derived from Old English 'lūs', of Germanic origin; related to Dutch 'luis' and German 'Laus'.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Louse. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/louse
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