An argument that presents two equally unattractive alternatives.
A dilemma is a form of argument in which two alternatives are presented, both of which lead to an undesirable conclusion. The arguer attempts to force the opponent to choose between these two alternatives, thereby demonstrating the opponent's position to be untenable.
See also Figures of Reasoning.
Here is an example of a dilemma from Shakespeare's Hamlet:
To be, or not to be: that is the question:
Whether 'tis nobler in the mind to suffer
The slings and arrows of outrageous fortune,
Or to take arms against a sea of troubles,
And by opposing end them?