adj · name · noun · prep · 7 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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CMU ARPABET 2:TH AO1 R OW0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Painstaking and careful not to miss or omit any detail.
Definition source: English Wiktionary via Wiktextract
Examples
The Prime Minister announced a thorough investigation into the death of a father-of-two in police custody.
Not enough! Your work has to be thorougher than this.
It's the most thorough artwork I have ever seen!
The infested house needs a thorough cleansing before being inhabitable again.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adj
Meaning 2
Utter; complete; absolute.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
name
Meaning 3
A scheme devised in 17th-century England by Thomas Wentworth, 1st Earl of Strafford to establish absolute monarchy in England, involving the appointment of Arminian clergy.
Definition source: English Wiktionary via Wiktextract
Usage: historical
Topics: Christianity
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
A furrow between two ridges, to drain off the surface water.
Definition source: English Wiktionary via Wiktextract
Usage: UK, dialectal
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
prep
Meaning 5
Through.
Definition source: English Wiktionary via Wiktextract
Usage: archaic
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
adjective satellite
Meaning 6
painstakingly careful and accurate
Definition source: Princeton WordNet 3.0
Examples
our accountant is thorough
thorough research
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
adjective satellite
Meaning 7
performed comprehensively and completely
Definition source: Princeton WordNet 3.0
Examples
an exhaustive study
made a thorough search
thoroughgoing research
Meaning relationships
Synonyms: exhaustive, thoroughgoing
Antonyms: none provided
History
Etymology
From Middle English thoruȝ, þoruȝ, from Old English þuruh, a byform of Old English þurh, whence comes English through. The adjective derives from the preposition and adverb. The word developed a syllabic form in cases where the word was fully stressed: when it was used as an adverb, adjective, or noun, and less commonly when used as a preposition.
Across languages
Translations
98 source translations are retained for this English entry.