most yo-yo (adjective) capricious: given to sudden behavior change
Sinonime: baste, beat, belt, cane, dust someone's britches, flay, hide, hit,
lambaste, lash, leather, paddle, paddlewhack, punish, spank, strap, strike,
switch, tan one's hide, thrash, warm someone's seat, wax, whack, whale, whomp
Antonime: constant,
dependable,
sensible,
staid,
steadfast,
steady