compleasancy 

Describing an incredibly pleasant state of affairs that render one complacent to a fault

She is dating this incredibly boring but incredibly nice guy - lulling her into compleasancy.

compleasancy by wonderspeller March 2, 2015

Compleasant 

Easy going, relaxed, one who doesn't overreact, not worried

A high school student was compleasant about his upcoming final exam.
When arguing with his girlfriend, he remained compleasant

Compleasant by rolling the dice January 10, 2017