Synonyms for Imponderous:

• adj.

  •light (adjective)
  • agile,
  • Floatable,
  • crumbly,
  • lithe,
  • slight,
  • petty,
  • loose,
  • buoyant,
  • feathery,
  • slender,
  • ethereal,
  • graceful,
  • airy,
  • weightless,
  • filmy,
  • trifling,
  • small,
  • sprightly,
  • inconsequential,
  • atmospheric,
  • sylphlike,
  • flimsy,
  • downy,
  • thin,
  • unheavy,
  • featherweight,
  • effervescent,
  • meager,
  • sandy,
  • insubstantial,
  • friable,
  • Gossamery,
  • tissuelike,
  • porous,
  • easy,
  • sheer,
  • nimble,
  • unsubstantial,
  • little,
  • fluffy,
  • dainty,
  • portable,
  • trivial,
  • floating,
  • light-footed,
  • spongy,
  • delicate,
  • frothy,
  • lightest.
  •lightweight (adjective)
  • foolish,
  • insignificant,
  • failing,
  • of no account,
  • paltry,
  • unimportant,
  • worthless,
  • incompetent.

• Other synonyms:

  •Other relevant words:
  • yeasty,
  • Frithy,
  • souffle,
  • bubbly,
  • aire,
  • foamy,
  • volatile.

Antonyms for Imponderous:

• adj.

  • light
    dark, large, fat, strong, solemn, strict, big, brunette, important, gloomy, significant, rough, serious, black, oppressive, laborious, darkened, thick, clumsy, useful, dusky, weighted, grave, coarse, obscure, difficult, heavy, dim.
  • lightweight
    heavyweight, major, consequential.