vrtkavý znamená v angličtina

capricious▼(impulsive and unpredictable; determined by chance, impulse, or whim)
adjective
[UK: kə.ˈprɪ.ʃəs] [US: kə.ˈprɪ.ʃəs]

fickle▼(quick to change one’s opinion or allegiance)
adjective
[UK: ˈfɪk.l̩] [US: ˈfɪk.l̩]