情なさけ知しらず

noun which may take the genitive case particle 'no', na-adjective, noun

coldhearted; pitiless; merciless; heartless

Describes a person or action lacking compassion or mercy. Can be used as a noun or adjectivally with な or の.

• 彼かれは情なさけ知しらずの男おとこだ。

  He is a heartless man.

• そんな情なさけ知しらずなことを言いうなんて信しんじられない。

  I can't believe you'd say such a pitiless thing.