Flighty (6)
I believe the answer is:
fickle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flighty</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fickle that I've seen before include "Changeable (with regard to loyalty)" , "Erratic, unpredictable" , "Liable to sudden unpredictable change" , "Prone to shifting loyalties" , "Often changing, not reliable emotionally" .)