Synonyms for highly doubtful

Synonyms for highly

extremely (incredibly, exceedingly, supremely >>)
particularly
most
heavily (largely, strongly, strong >>)
hugely (immensely, enormously, tremendously >>)
greatly
much
severely (seriously, badly, sorely >>)
very much

See all synonyms for highly

Synonyms for doubtful

questionable (dubious, unlikely, problematic >>)
uncertain (unsure, unreliable, inauthentic >>)
suspicious (shady, fishy, distrustful >>)
equivocal
suspect
shaky
in question
queer

See all synonyms for doubtful