fickle (adjective) fickle: vacillating, blowing hot and cold
Sinonime: backward, birdbrained,
defective,
dim, dim-witted, dopey,
dull, dumbbell, dumbo, dumdum,
dummy,
exceptional, feeble-minded, gorked, half-witted, held back,
imbecile, lamebrained, mentally defective,
moronic, numbskull,
opaque, pinhead, retardo,
sappy,
simple, simple-minded,
slow, slow-witted,
stupid, subnormal,
touched, underachieving,
weak, yo-yo
Antonime: aware,
cognizant,
constant,
faithful,
reliable,
stable,
steady