also: ときがたい
i-adjective
difficult to explain; hard to put into words
Used when a concept, feeling, or situation is inherently complex or subtle and resists easy explanation.
この現象を言葉で説明するのは説き難い。
This phenomenon is difficult to explain in words.
彼の気持ちは説き難い
His feelings were so complex that they were hard to put into words.