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feeling, causing, doubt

questionable, unclear

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Cases of word usage

1) an agreement to risk money etc on an event of which the result is doubtful (bet)

2) clear; not doubtful or uncertain (definite)

3) (of a word) having a double or doubtful meaning (equivocal)

4) an old story handed down from the past, especially one of doubtful truth (legend)

5) a state of mind or spirit; one of the groups of forms that a verb may take to show whether things are regarded as certain, possible, doubtful etc (mood)

6) (especially of a result or future) doubtful (problematic)

7) an attempt to avoid an honest answer by using a secondary or doubtful meaning of a word or phrase; to argue about small points or differences (quibble)

DOUBTFUL as in Wiktionary
DOUBTFUL as in Wikipedia