doubtful

Meanings

1. 1
   adj

   Unlikely or uncertain to happen or be true.

   It is doubtful whether the rope will hold.

2. 2
   adj

   Feeling unsure or having doubts.

   She looked doubtful about the plan but said nothing.

3. 3
   adj

   Possibly dishonest or of questionable quality.

   The deal involved some people of rather doubtful character.

From Middle English doutfull, douteful, equivalent to doubt + -ful.

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