Vagary

Va*ga"ry (?), n.; pl. Vagaries (#). [L. vagari to stroll about. See Vague.]

1. A wandering or strolling. [Obs.]

2. Hence, a wandering of the thoughts; a wild or fanciful freak; a whim; a whimsical purpose. "The vagaries of a child." Spectator.

They changed their minds,
Flew off, and into strange vagaries fell.