艱険

(1)difficult to accomplish; demanding considerable mental effort and skill; "the arduous work of preparing a dictionary"

(2)成し遂げるのは困難である

(3)かなりの精神的努力と技能を要求する

(4)having a sharp inclination; "the steep attic stairs"; "steep cliffs"

(5)鋭く傾斜しているさま

(6)taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt

(7)極力課税するさま

(8)耐久力をテストします

(1)