# viper

/ˈvaɪpɝ/ (US) · /vˈaɪpɐ/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/viper
Updated: 2026-08-15

## Definition

a type of poisonous snake with long teeth. You can also use this word to describe a person who is mean or tries to hurt others secretly.

For teachers: a venomous snake belonging to the family Viperidae, characterised by long, hinged fangs. Figuratively describes a person perceived as treacherous, malicious, or spiteful.

## Examples

- The hiker saw a viper hiding in the tall grass.
- He warned his colleagues that the new manager was a viper who would betray them to get a promotion.
- The protagonist soon realised that the court was filled with vipers, each waiting for a moment of weakness to strike at his reputation.

## Usage notes

- When used figuratively for a person, it carries a strong negative connotation of betrayal.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.