Simple past tense and past participle of trouble.(verb)
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Use "troubled" in a sentence
"Nothing that she could put her finger on, but he walked silently next to her, his expression troubled and withdrawn."
"Officials now propose buying what they term troubled assets, without specifying the type, according to a document obtained by Bloomberg News and confirmed by a congressional aide."
"She was frowning, her brow furrowed, her expression troubled."