Word Study
imponderability
CIDE DICTIONARY
imponderability, n. [Cf. F. impondérabilité.].
The quality or state of being imponderable; imponderableness. [1913 Webster]
ROGET THESAURUS
imponderability
Levity
N levity, lightness, imponderability, buoyancy, volatility, feather, dust, mote, down, thistle, down, flue, cobweb, gossamer, straw, cork, bubble, balloon, float, buoy, ether, air, leaven, ferment, barm, yeast, lighter-than-air balloon, helium balloon, hydrogen balloon, hot air balloon, convection, thermal draft, thermal, light, subtile, airy, imponderous, imponderable, astatic, weightless, ethereal, sublimated, gossamery, suberose, suberous, uncompressed, volatile, buoyant, floating, portable, light as a feather, light as a thistle, light as air, lighter than air, rise like a balloon, float like a balloon.For further exploring for "imponderability" in Webster Dictionary Online