Source : Webster's Revised Unabridged Dictionary (1913)

Monkish \Monk"ish\, a.
   Like a monk, or pertaining to monks; monastic; as, monkish
   manners; monkish dress; monkish solitude. -- {Monk"ish*ness},
   n.

Source : WordNet®

monkish
     adj : befitting a monk; inclined to self-denial