A trilemma is a difficult choice from three options, each of which is (or appears) unacceptable or unfavourable.
There are two logically equivalent ways in which to express a trilemma: it can be expressed as a choice among three unfavourable options, one of which must be chosen, or as a choice among three favourable options, only two of which are possible at the same time.
The term derives from the much older term dilemma, a choice between two or more difficult or unfavourable alternatives.
The earliest recorded use of the term was by the British preacher Philip Henry in 1672, and later, apparently independently, by the preacher Isaac Watts in 1725.
Read more about Trilemma: Trilemma in Law, Trilemmas in Economics, The Münchhausen Trilemma, The Trilemma of The Earth, The Žižek Trilemma