Other forms: vagaries
A vagary is an unpredictable change or whim. The vagaries of the weather, vagaries of fashion, the vagaries of fate.
It is almost always plural and almost always followed by of, so it names the unreliability of something rather than a single event. The Latin is to wander, which is what a vagary does.
1nounvagaryAn unpredictable change or whim.
“No harvest plan survives the vagary of an English summer.”
vagary is a change.
Italian vagare and Latin vagari both mean to wander, from vagus, wandering, which also gives vague.
Latin
vagor — to wander
Italian
vagare — wander
English, today
vagary
From Italian vagare (“wander”) and/or its source Latin vagor (“to wander”), from Latin vagus (“wandering”). Later apparently reinterpreted in English as vague + -ery but without changing the spelling. by surface analysis, vag(us) + -ary.
Etymology from Wiktionary, CC BY-SA