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"impressive" is also used as a crossword clue. If that's what you saw, the answer is often imposing (8 letters).
Definitions
producing a strong effect
Word origin
From impress + -ive.
Used in a sentence
“an impressive speech”
“an impressive movie”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Causing admiration”10 letters
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