ABSTRUSE

[adjective] - difficult to understandan abstruse philosophical essayI found her argument very abstruse. absurd [adjective] [+ to infinitive] - ridiculous or unreasonable; foolish in an amusing wayIt was completely absurd (of him) to expect us to finish by Friday.What an absurd thing to say!Don't be so absurd! Of course I want you to come.It's an absurd situation - neither of them will talk to the other.He looked absurd in those old-fashioned trousers.