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"dangerous" is also used as a crossword clue. If that's what you saw, the answer is often risky (5 letters).
Definitions
causing fear or anxiety by threatening great harm
Word origin
From Middle English dangerous (“difficult, severe, domineering, arrogant, fraught with danger”), daungerous, from Anglo-Norman [Term?], from Old French dangereus (“threatening, difficult”), from dangier. Equivalent to danger + -ous.
Used in a sentence
“Railway crossings without gates are highly dangerous.”
“Young Indians looking for work opportunities have made up a sizeable portion of undocumented migrants in the US, many after making the dangerous trek through Latin America to reach the US southern border.”
“If they incline to think you dangerous, / They have their knaviſh Arts to make you ſo.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer8 curated clues
01“Full of possible harm”9 letters
02“Full of risk”9 letters
03“Not safe”9 letters
04“Not safe to approach”9 letters
05“Risky or unsafe”9 letters
06“Unsafe”9 letters
07“Unsafe to handle”9 letters
08“Likely to cause harm”9 letters
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