If you describe someone or something as unexciting, you think they are rather boring, and not likely to shock or surprise you in any way. He is regarded as very capable but unexciting.

What is it called when something is incomprehensible?

unimaginable, unintelligible, puzzling, impenetrable, opaque, unfathomable, baffling, mystifying, inconceivable, cryptic, enigmatic, inscrutable, mysterious, obscure, perplexing, sibylline, unclear, beats me, clear as mud, fathomless.

What does it mean when something is unresolved?

: not settled, solved, or brought to resolution : not resolved an unresolved issue a question that was left unresolved.