nocuous

C2+ Topic:Safety & Risk

US /ˈnɑkjuəs/ UK /ˈnɒkjuəs/ See IPA manual

adj

Meanings

1

adj
harmful, noxious, or poisonous

The factory released a nocuous vapor that sickened nearby residents.

Thesaurus

Synonyms

1 adj · harmful, noxious, or poisonous harmful noxious injurious poisonous toxic hurtful

Opposites

innocuous harmless benign

Word family

Related forms innocuous nocent nuisance

Etymology

From Latin nocuus ('harmful'), from nocere ('to harm, injure').

nocuus Latin nocere Latin

View etymology graph ->

Topics

Safety & Risk Word Formation & Derivatives

# nocuous

**Type:** Word
**Level:** C2+
**Part of speech:** adj
**IPA (US):** ˈnɑkjuəs
**IPA (UK):** ˈnɒkjuəs

## Meanings
1. harmful, noxious, or poisonous

## Examples
- The factory released a nocuous vapor that sickened nearby residents.

## Synonyms
- harmful
- noxious
- injurious
- poisonous
- toxic
- hurtful

## Antonyms
- innocuous
- harmless
- benign

## Related Forms
- innocuous
- nocent
- nuisance

## Roots and Affixes
- Root: nocuus
- Root: nocere

## Etymology
From Latin nocuus ('harmful'), from nocere ('to harm, injure').

## AI Etymology
Nocuous comes from Latin nocuus ('harmful'), from nocere ('to harm, injure'). The form is best read as a historical transfer or inheritance, with its older language material carrying the main semantic load. As an adjective, it carries the sense "harmful, noxious, or poisonous", with the older formation still helping explain the modern use. Relevant historical forms include Latin nocuus and Latin nocere. Related words include innocuous, nocent, nuisance.

## Topics
- Safety & Risk
- Word Formation & Derivatives

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nocuous

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