(ת') לא ניתן להערכה מדויקת, שקשה לאמוד אותו

(ש"ע) דבר שלא ניתן להערכה מדויקת, דבר שקשה לאמוד אותו

adj. may not be precisely evaluated, may not be precisely determined

n. something which may not be precisely evaluated, something which may not be precisely determined

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Noun
1. a factor whose effects cannot be accurately assessed; "human behavior depends on many imponderables"
(hypernym) influence
(hyponym) leaven, leavening

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Adjective
1. difficult or impossible to evaluate with precision; "such imponderable human factors as aesthetic sensibility"
(antonym) ponderable

adj. imponderable, may not be precisely evaluated, may not be precisely determined

nm. intangible, imponderables, unknown quantity

adj. imponderable

(n.)
An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism, regarded as subtile fluids destitute of weight but in modern science little used.
  

(a.)
Not ponderable; without sensible or appreciable weight; incapable of being weighed.