1) Arbitrariness 2) Caprice 3) Flightiness 4) Indecisiveness 5) Unpredictability 6) Whimsicality 7) Whimsy 1) Changefulness 2) Inconstancy 3) Unpredictability 
[n] - the quality of being guided by sudden unpredictable impulses
capricious, capriciousness, capriciously 1. Subject to, led by, or indicative of caprice or whim; erratic: 'She's such a capricious mother that I never know how she'll react when I tell I'm engaged.' 2. Characterized by or subject to whim; impulsive and unpredictable. To be capricious, as stated above, is to be governed by 'whim' or 'chance', 'to...