impulsive and unpredictable; subject to whim capricious ADJECTIVE impulsive and unpredictable; subject to whim
cloister VERB To seclude or shut up in
lack of similarity or equality; inequality; difference disparity NOUN lack of similarity or equality; inequality; difference
capacity for producing a desired result or effect; effectiveness efficacy NOUN capacity for producing a desired result or effect; effectiveness
a letter, esp. a formal or didactic one epistle NOUN a letter, esp. a formal or didactic one
idiosyncrasy NOUN a mode of behavior or way of thought peculiar to an individual; a distinctive or peculiar feature or characteristic
a moving force; impulse; stimulus impetus NOUN a moving force; impulse; stimulus
moribund ADJECTIVE in a dying state; near death; on the verge of extinction or termination
reticent ADJECTIVE disposed to be silent or not to speak freely; reluctant , reserved, or restrained
to waver in mind or opinion; to be indecisive or irresolute vacillate VERB to waver in mind or opinion; to be indecisive or irresolute