If there is no doubt about it, it's unequivocal. An unequivocal response to a marriage proposal? "Yes. Yes! A thousand times yes!"

Equivocal is from a Latin word meaning of equal voice, so unequivocal means of unequal voice — unmistakable, unambiguous, without question. There might be unequivocal evidence tying a suspect to a crime, or unequivocal support for a popular leader. If you explain something in unequivocal terms, then your words should be clear to everyone.

Definitions of unequivocal
  1. adjective
    admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion
    unequivocal evidence”
    “took an unequivocal position”
    “an unequivocal success”
    “an unequivocal promise”
    “an unequivocal (or univocal) statement”
    synonyms: unambiguous, univocal
    having or exhibiting a single clearly defined meaning
    expressing finality with no implication of possible change
    free from ambiguity
    not open to question
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    ambiguous, equivocal
    open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead
    having more than one possible meaning
    double, forked
    having two meanings with intent to deceive
    deliberately vague or ambiguous
    of uncertain or ambiguous nature
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  2. adjective
    clearly defined or formulated
    “"the plain and unequivocal language of the laws"- R.B.Taney”
    synonyms: definitive
    explicit, expressed
    precisely and clearly expressed or readily observable; leaving nothing to implication
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