imponderable

Adjective
  1. Difficult or impossible to evaluate with precision (synset 301820954)
    "such imponderable human factors as aesthetic sensibility"
Noun
  1. A factor whose effects cannot be accurately assessed (synset 105701171)
    "human behavior depends on many imponderables"
    is a type of: influence - a cognitive factor that tends to have an effect on what you do
    subtypes: leaven, leavening - an influence that works subtly to lighten or modify something

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