Both Uses

equivocal
in
A Hologram for the King
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He was tired, and he was drunk, he now knew unequivocally that he was drunk, and one should not call one's daughter in such a state, especially when trying to instill her with confidence about his ability to provide for her.†
p. 111.3 *

unequivocally = without ambiguity (in a completely clear manner)

standard prefix: The prefix "un-" in unequivocally means not and reverses the meaning of equivocally. This is the same pattern you see in words like unhappy, unknown, and unlucky.
He had been told unequivocally that though there were plenty of women doctors in the Kingdom, they wore abayas, and rarely if ever treated men.†
p. 158.8

Definitions:

(1) (equivocal)
unclear in meaning -- especially where opposing interpretations are reasonable (sometimes intentionally)
(2) (meaning too rare to warrant focus)
The form unequivocal (not equivocal; or clean in meaning) is encountered much more frequently, but equivocal is seen on many more SAT review lists.