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"suspicious" is also used as a crossword clue. If that's what you saw, the answer is often fishy (5 letters).
Definitions
Causing doubt or seeming possibly wrong or dishonest.
Word origin
From Old French sospecious, from Latin suspiciosus, suspitiosus.
Used in a sentence
“His suspicious behaviour brought him to the attention of the police.”
“If their views were entrancing their sanitation was primeval; if they possessed stables they were also next to the gas-works; if their gardens were delightful there were odours suspicious of mice in the bedrooms.”
“We know he has a suspicious attitude to get-rich-quick schemes.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Causing doubt”10 letters
02“Raises doubts”10 letters
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