doubtful

1 ENTRIES FOUND:
doubtful /ˈdaʊtfəl/ adjective
doubtful
/ˈdaʊtfəl/
adjective
Britannica Dictionary definition of DOUBTFUL
[more doubtful; most doubtful]
1 
: uncertain or unsure about something
— often + about or of
2 
: not likely to be true : not probable
— often + that, if, or whether
3 
: likely to be bad : not worthy of trust
4 
: not certain : unknown or undecided

— doubtfully

adverb