Added 9 October 2026
thorough
/ˈθʌɹə/ adjective
adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about thorough at Wordnik → Where our words come from →
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Painstakingly careful and accurate.
our accountant is thorough
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Performed comprehensively and completely; not superficial or partial.
an exhaustive study
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Without qualification; used informally as (often pejorative) intensifiers.
an arrant fool
Origin
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.
From Wiktionary, via Kaikki.org (CC BY-SA)