negative form of 難い / (literary) easy to

pain, pain, go away

頭: head

ouch

(idiomatic) Not caring at all, being no skin off one's nose, being of no concern at all.

a vehicle decorated with images of fictional anime, manga, or game characters

(kyabakura industry) horrid client

head / counter for large animals

head (body part) / (anatomy, archaic, possibly obsolete) the fontanelle part of the skull

a head, as when counting people, or cattle or other livestock