The antonym of ‘Fickle’ -

Fickle(adjective):Meaning: Changing frequently, especially as regards one's loyalties or affections..Bengali meaning - চঞ্চল; অস্থির; পরিবর্তনশীলSynonym: capricious, changeable, variable, volatile, mercurial, vacillating, fitful, irregular, inconstant, disloyal, undependable, unstable, unsteady, unfaithful, faithless.Antonym: constant, stableMeaning of other words:Diseased: অসুস্থ; পীড়িত; ব্যাধিগ্রস্ত; ব্যায়রামী;Source: Oxford Dictionary