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"thorough" is also used as a crossword clue. If that's what you saw, the answer is often exhaustive (10 letters).
Definitions
painstakingly careful and accurate
Word 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.
Used in a sentence
“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!”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Meticulous”8 letters
02“Complete and careful”8 letters
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