непостоянен meaning in English

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

changeable▼(subject to sudden or frequent changes)
adjective
[UK: ˈtʃeɪn.dʒə.bəl] [US: ˈtʃeɪn.dʒə.bəl]

changeful▼(changing frequently)
adjective
[UK: ˈtʃeɪndʒ.fəl] [US: ˈtʃeɪndʒ.fəl]

erratic▼(unsteady, random; prone to unexpected changes; not consistent)
adjective
[UK: ɪ.ˈræ.tɪk] [US: ɪ.ˈræ.tɪk]

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

fluid▼(in a state of flux; subject to change)
adjective
[UK: ˈfluːɪd] [US: ˈfluːəd]

impermanent▼(not permanent)
adjective
[UK: ɪm.ˈpɜː.mə.nənt] [US: ɪm.ˈpɝː.mə.nənt]

inconstant▼(not constant)
adjective
[UK: ɪnˈk.ɒn.stənt] [US: ɪnˈk.ɒn.stənt]

uneven▼(not uniform)
adjective
[UK: ʌn.ˈiːv.n̩] [US: ʌ.ˈniːv.n̩]

unsteady▼(lacking regularity)
adjective
[UK: ʌn.ˈste.di] [US: ʌn.ˈste.di]

volatile▼(fickle)
adjective
[UK: ˈvɒ.lə.taɪl] [US: ˈvɑː.lə.təl]