fickle.

Prone to changing tastes, loyalties, or feelings readily and unpredictably.

Use it for

Words that belong together

• fickle loyalties
• fickle fortune

On the page

The audience’s fickle loyalties unsettled the speaker more than open criticism.

She had learned not to plan around his fickle enthusiasm.

Usage notes

Primary category: literary. Forms: Comparative more fickle; superlative most fickle where gradation is meaningful. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.