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"unlikely" is also used as a crossword clue. If that's what you saw, the answer is often improbably (10 letters).
Definitions
has little chance of being the case or coming about
Word origin
From Middle English unlykely, unlikly, unlykly, unlicli, equivalent to un- + likely.
Used in a sentence
“It is pretty unlikely that you'll win, but I will pray that at least you do well.”
“In the highly unlikely event of landing in water, lifejackets are stored under the seat.”
“The Saturday evening Cardiff-West Wales mail train is still steam-worked, but a most unlikely locomotive used on May 23 was Stanier Class 5 4-6-0 No. 45250 (5A); it returned on May 25 with a train of steel billets.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not probable”8 letters
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