POTUS said Kim was mecurial 2X

ADJECTIVE

(of a person) subject to sudden or unpredictable changes of mood or mind.

"his mercurial temperament"

synonyms:

volatile · capricious · temperamental · excitable · fickle · changeable · unpredictable · variable · protean · mutable · erratic · quicksilver · inconstant · inconsistent · unstable · unsteady · fluctuating · ever-changing · kaleidoscopic · fluid · wavering · vacillating · moody · flighty · wayward · whimsical · giddy · impulsive · l