The quality of being guided by sudden unpredictable impulses.

synonym: unpredictability.

Roget 139: irregularity, uncertainty, unpunctuality; fitfulness etc. adj.; capriciousness, ecrhythmus^†.   

Dutch: onvoorspelbaarheid
Polish: wybredność

The trait of acting unpredictably and more from whim or caprice than from reason or judgment.

synonyms: arbitrariness, flightiness, whimsey, whimsicality, whimsy.

Roget 608: caprice, fancy, humor; whim, whimsy, whimsey^†, whimwham^†; crotchet, capriccio, quirk, freak, maggot, fad, vagary, prank, fit, flimflam, escapade, boutade [Fr.], wild-goose chase; capriciousness etc. adj.; kink.    ... show more

Dutch: willekeur
Polish: arbitralność