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"obviously" is also used as a crossword clue. If that's what you saw, the answer is often duh (3 letters).
Definitions
unmistakably (‘plain’ is often used informally for ‘plainly’)
Word origin
From obvious + -ly.
Used in a sentence
“She was in floods of tears and obviously very upset.”
“She'd obviously not gone to sleep yet: her eyes were bloodshot with sleepiness.”
“The plane has obviously been delayed.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“clearly”9 letters
02“No surprise”9 letters
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