INCONSTANT
Meaning of INCONSTANT in English
in ‧ con ‧ stant /ɪnˈkɒnstənt $ -ˈkɑːn-/ BrE AmE adjective literary
unfaithful in love or friendship
—inconstancy noun [uncountable]
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012