• 彼の言うことは難解だ
    • What he says is hard [difficult] to understand.
    • その論文には難解な箇所がいくつかある
    • There are several puzzling passages in that thesis.
    • 難解な理論
    • an abstruse theory
    • 難解な文体[詩]
    • an esoteric style [poem]