FLIGHTINESS
\flˈa͡ɪtɪnəs], \flˈaɪtɪnəs], \f_l_ˈaɪ_t_ɪ_n_ə_s]\
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the trait of acting unpredictably and more from whim or caprice than from reason or judgment; "I despair at the flightiness and whimsicality of my memory"
By Princeton University
By Noah Webster.