Synonyms of the word

doubtful

• adj. Subject to, or causing doubt.
• adj. Experiencing or showing doubt, sceptical.
• adj. Undecided or of uncertain outcome.
• adj. (obsolete) Fearsome, dreadful.
• adj. Improbable or unlikely.
• adj. Suspicious, or of dubious character.
• adj. Unclear or unreliable.
• n. A doubtful person or thing.

dubious

• adj. Arousing doubt; questionable; open to suspicion.
• adj. In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.

dubitable

• adj. Capable of being doubted; susceptible of being questioned.

incertain

• adj. uncertain.

questionable

• adj. (obsolete) Inviting questions; inviting inquiry.
• adj. Problematic; open to doubt or challenge.
• adj. Of dubious respectability or morality.

tentative

• n. A trial; an experiment.
• adj. Of or pertaining to a trial or trials; essaying; experimental.
• adj. Uncertain; subject to future change.

uncertain

• adj. Not certain; unsure.
• adj. Not known for certain; questionable.
• adj. Not yet determined; undecided.
• adj. Variable and subject to change.
• adj. Fitful or unsteady.
• adj. Unpredictable or capricious.
• n. (with "the") Something uncertain.

unsettled

• adj. Disturbed, upset.
• adj. Not in a steady condition, uncertain, subject to change.
• adj. Not populated, having no settlers or other inhabitants.
• adj. Unpaid.
• v. simple past tense and past participle of unsettle.

unsure

• adj. uncertain.
• adj. unstable or precarious.