douteuses

In a sentence

• Ses intentions étaient douteuses.

  Her intentions were dubious.

  In this sentence, 'douteuses' is used as an adjective to describe 'intentions', indicating that her motives seemed questionable or uncertain.

• Elle a acheté des marchandises douteuses au marché.

  She bought questionable goods at the market.

  Here, 'douteuses' is used to describe 'marchandises', meaning that the goods may have an uncertain or suspicious quality or origin.

• Les théories qu'il a proposées sont douteuses.

  The theories he proposed are dubious.

  In this example, 'douteuses' characterizes 'théories' as potentially unreliable or not credible.