What's the difference between monasticism and monkish?

Monasticism

Definition:

Example Sentences:

(1) It was a taste of off-grid hippy monasticism inspired by his time at Taliesin West, where each student had to build their own shelter in the desert (a tradition that continues there today), and an embodiment of his underlying motive to “frugalise the frenzied consumerist juggernaut”.
(2) Shielded from Europe, Copts developed distinctive customs such as fasting, monasticism and the usage of liturgical Coptic, derived from the Pharaonic language of ancient Egypt.
(3) A preoccupation with time is central to Western culture and is traceable to the social context--thirteenth-century monasticism--in which the clock was first invented.
(4) It left me with a sense that people need to be able to put their case.” Rose studied history – the Crusades and Anglo-Saxon monasticism – at Oxford, graduating with a first-class degree.
(5) Bishop Angaelos describes the evening as "surreal", though it is unclear whether this surreality comes from today's news, or from his sandy surroundings, which Angaelos claims to be the birthplace of monasticism.

Definition:

(a.) Like a monk, or pertaining to monks; monastic; as, monkish manners; monkish dress; monkish solitude.

Example Sentences:

(1) The mature prose of America's elder statesman of letters has the sheen, rhythm and simplicity of greatness: words written and rewritten in almost monkish seclusion.
(2) One might describe it as monkish, but Sjöwall's life has not been monkish, as I will find out.
(3) It’s a little more ornate than earlier incarnations, still hinting at monkish humility, but with a little bit of dashing mystery thrown in for good measure.
(4) Yet if he doesn't want to talk about the difficult issues facing Britain's biggest retailer he may end up in a vow of monkish silence, because they are backing up.
(5) Men wear trilbys, are monkish and self-importantly pensive.