imponderable

/ษชmหˆpษ’ndษ™ษนษ™bl/

IPA: /IH0 M P AA1 N D ER0 AH0 B AH0 L/

noun
  1. 1

    An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.

  2. 2

    An imponderable question.

adjective
  1. 1

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

  2. 2

    Difficult or impossible to comprehend or evaluate.

Source: https://en.wiktionary.org/wiki/imponderable