eindeutig in English:

On the other hand, a high five (arguably a variety of handshake) pretty unambiguously expresses satisfaction or congratulations—but that’s the exception. I think the notion that we all need to perfect the art of shaking hands—and reading handsha

Their deep love for each other was unequivocal.

Ed Miliband claims the prime minister has failed to send a clear and unequivocal message to Israel and Hamas to seek lasting peace

"an unequivocal answer"

It is an unequivocal fact that we’ve not met nor communicated before.