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

