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"carefully" is also used as a crossword clue. If that's what you saw, the answer is often diligently (10 letters).
Definitions
taking care or paying attention
Word origin
From Middle English carfulli, carefulliche, from Old English carfullīċe, ċearfullīċe (“carefully, diligently”), equivalent to careful + -ly.
Used in a sentence
“[…] there was she faine / To call them all in order to her ayde, / And them conjure, upon eternall paine, / To counsell her, so carefully dismayd, / How she might heale her sonne […]”
“As he was a politician, he discussed all subjects carefully, not offending anyone.”
“He carefully studied the papers, while planning his next move.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Cautiously”9 letters
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