assiduous

C1 Topic:Describing Qualities

US /əˈsɪdʒ.u.əs/ UK /əˈsɪd.ju.əs/ See IPA manual

Meanings

1

adj
showing great care, attention, and effort in one's work or duties

Her assiduous nature ensured that every detail was perfect.
2

adj
marked by persistent application or diligence

He was assiduous in his studies, never missing a single lecture.

Thesaurus

Synonyms

1 adj · showing great care,... diligent meticulous attentive industrious thorough

2 adj · marked by persistent... persistent diligent dedicated unflagging tireless

Opposites

lazy negligent careless slack

Appears in

Phrases (1)

See all

assiduous research
careful investigation pursued with steady attention and persistent effort

Adjective + noun

Etymology

From Latin assiduus ('constantly present, busy'), from assidere ('to sit beside, attend to'), itself from ad- ('to, towards') + sedere ('to sit'); into Modern English assiduous ('persistently diligent and attentive').

Topics

Describing Qualities Word Formation & Derivatives

External links

# assiduous

**Type:** Word
**Level:** C1
**Part of speech:** adj
**IPA (US):** /əˈsɪdʒ.u.əs/
**IPA (UK):** /əˈsɪd.ju.əs/

## Meanings
1. showing great care, attention, and effort in one's work or duties
2. marked by persistent application or diligence

## Examples
- Her assiduous nature ensured that every detail was perfect.
- He was assiduous in his studies, never missing a single lecture.

## Synonyms
- diligent
- meticulous
- attentive
- industrious
- thorough
- persistent
- dedicated
- unflagging
- tireless

## Antonyms
- lazy
- negligent
- careless
- slack

## Etymology
From Latin assiduus ('constantly present, busy'), from assidere ('to sit beside, attend to'), itself from ad- ('to, towards') + sedere ('to sit'); into Modern English assiduous ('persistently diligent and attentive').

## AI Etymology
Assiduous comes from Latin assiduus ('constantly present, busy'), from assidere ('to sit beside, attend to'), itself from ad- ('to, towards') + sedere ('to sit'); into Modern English assiduous ('persistently diligent and attentive'). In current use it is an adjective meaning "showing great care, attention, and effort in one's work or duties". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The surface form is compositional: its joined elements remain visible in the modern word. The word's history is thus visible in its construction: the components remain interpretable even after the whole expression has settled into a conventional English meaning.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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