UNCERTAIN: значение слова

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Merriam-Webster's Collegiate® Dictionary, 11th Edition

UNCERTAIN

adjective
Date: 14th century
indefinite , indeterminate , not certain to occur ; problematical , not reliable ; untrustworthy ,

4. not known beyond doubt ; dubious , not having certain knowledge ; doubtful , not clearly identified or defined , not constant ; variable , fitful , uncertainly adverb uncertainness noun