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Apprehensive

(adj.) Anxious and fearful about the future; uneasy.

Categorical

(adj.) Without exception or qualification; positive; absolute.

Conclusive

(adj.) Serving to put an end to doubt, question, or uncertainty; decisive; convincing.

Dubious

(adj.) Doubtful or uncertain; questionable as to quality or validity.

Indeterminate

(adj.) Not capable of being decided or established; not precisely known; indefinite.

Inevitable

(adj.) Incapable of being avoided or prevented.

Precarious

(adj.) Dangerously lacking in security or stability; unsafe; risky.

Qualm

(noun) A sensation of doubt or misgiving; uneasiness; a pang of conscience.

Unequivocal

(adj.) Leaving no doubt or misunderstanding; perfectly clear.

Vacillate

(verb) To waver indecisively between one course of action or opinion and another; hesitate.