Meaning of 只管 in Japanese

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Definition of 只管

ひたすら(hitasura) · ひたぶる(hitaburu) 【只管 ·一向 ·頓】

(adj-na, adv) nothing but; earnest; intent; determined; set on (something)
彼はひたすら成功を望んで懸命に働く。
He works hard because he is anxious to succeed.

しかんたざ(shikantaza) 【只管打坐 ·祗管打坐】

(n) (Buddh) shikantaza (zazen meditation in which one focuses on sitting without actively seeking enlightenment)