Not affording certainty:
ambiguous, borderline, clouded, doubtful, dubious, dubitable, equivocal, inconclusive, indecisive, indeterminate, problematic, problematical, questionable, uncertain, unclear, unsure. (Informal) iffy. Idioms: at issue, in doubt, in question. See certain, clearInvolving possible risk, loss, or injury:
adventurous, dangerous, hazardous, jeopardous, parlous, perilous, risky, treacherous, unsafe, venturesome, venturous. (Slang) hairy. See safety
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