besetting

Etymology
From.

Noun

 * 1) The act of one who besets or attacks.

Adjective

 * 1) Deeply rooted; persistent.
 * 2) * 1907,, The Longest Journey, Part I, XIII [Uniform ed., p. 144]:
 * Rickie would not push himself. It was his besetting sin.
 * 1) Obsessive
 * 1) Obsessive
 * 1) Obsessive

Etymology
From, from. Equivalent to.

Noun

 * 1) occupation