Definition: an unexpected change in a situation or behavior
Part of Speech: Noun
Synonym(s): whim, notion
1. Because Phil is such a health nut, he shocked everyone with his vagary of smoking.
2. The conservative matron couldn’t understand the vagary in fashion which suddenly made going braless acceptable.
3. When our town had a blizzard on Monday and warm sunny weather on Tuesday, the change was a vagary of the weather.