Superlative for not known with certainty
“It remains doubtful if their strategy can stand up to the scrutiny of a court.”
Superlative for feeling uncertain about something
“They are doubtful of her being reunited with Ollie, after waiting more than two weeks for his return.”
Superlative for not likely to be true or to happen
“It is doubtful whether tomorrow's victor will reach quite the lofty heights of his predecessor.”
Superlative for tending to raise doubts or questions
“I discovered that they were based on extrapolations of doubtful validity on original data that were of questionable value.”
Superlative for experiencing or showing doubt or skepticism
“The contradictions left many social workers feeling doubtful about their own transformative potential.”
Superlative for dangerously insecure or unstable
“He implores her favor and protection in the doubtful dilemma in which is about to involve himself.”
Superlative for confused or perplexed
“He gave me a wary, doubtful look as I picked apart his arguments one by one.”
Superlative for shady or suspicious in nature
“Like the Spectator's lady of easy virtue, he finds an excuse for present doubtful dealings in his excellent future intentions.”
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