All 3 Uses

monk
in
The Fountainhead
(Auto-generated)

He did not look like an artist, he looked like the quarry worker, like a wrecker demolishing walls, and like a monk.†
Chpt 2.8 *
It became amusing, at first, to accept "Monk" Toohey; then it became distinctive and progressive.†
Chpt 2.9
This was just like Toohey, thought Keating; this pose amidst the severe fastidiousness of his living room; a single canvas by a famous artist on the wall behind him—and the rest of the room unobtrusive like a monk's cell; no, thought Keating, like the retreat of a king in exile, scornful of material display.†
Chpt 4.7

Definitions:

(1) (monk)
a male member of a religious order typically living under vows of poverty, chastity, and obedience
(2) (meaning too rare to warrant focus)