When I look back over there wartime years I cannot help feeling that time is an inadequate and even capricious measure of their duration at one moment they seem so long, at another so short.

misleading : giving the wrong idea or impression.
whimsical : acting or behaving in a capricious manner.
erratic : not even or regular in pattern or movement; unpredictable.
unpredictable : not able to be predicted; changeable.
capricious : given to sudden and unaccountable changes of mood or behaviour.


Synonym of capricious is whimsical