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"thoroughly" is also used as a crossword clue. If that's what you saw, the answer is often comprehensively (15 letters).
Definitions
in an exhaustive manner
Word origin
From thorough + -ly.
Used in a sentence
“He went out in the rain and came back thoroughly drenched.”
“The editor looked thoroughly for any mistakes in the paper.”
“Another option is to wash spinach and other leafy greens thoroughly in running water before eating them.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Completely”10 letters
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