doubtful


Concise Oxford English Dictionary © 2008 Oxford University Press:
doubtful/ˈdaʊtfl/
adjective
  • 1 uncertain.
  • 2 not known with certainty.

    ■ improbable.

    ■ not established as genuine.

– derivatives
doubtfully adverb,
doubtfulness noun.
'doubtful' also found in these Oxford entries:

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