" insubstantiality "

1: as in diaphanousness, wispiness;

•  Synonyms : 

•  diaphanousness,

•  flimsiness,

•  wispiness,

•  daintiness,

•  delicacy,

•  exquisiteness,

•  fineness,

•  fragility,

•  frangibility,

•  brittleness,

•  crumbliness,

•  friability

•  Antonyms : 

•  coarseness,

•  crudeness,

•  crudity,

•  roughness,

•  rudeness,

•  firmness,

•  solidity,

•  strength

2: as in unsoundness;

•  Synonyms : 

•  unsoundness,

•  insecurity,

•  instability,

•  precariousness,

•  shakiness,

•  unstableness,

•  unsteadiness,

•  changeability,

•  inconstancy,

•  mutability,

•  laxness,

•  looseness,

•  slackness

•  Antonyms : 

•  fastness,

•  fixedness,

•  security,

•  stability,

•  steadiness,

•  firmness,

•  soundness,

•  substantiality

1: being of a material lacking in sturdiness or substance;

  * e.g., " ... an insubstantial carton that could not possibly stand up during long-distance shipping "

•  Synonyms : 

•  cobwebby,

•  filmy,

•  flimsy,

•  frothy,

•  gauzy,

•  gossamer,

•  gossamery,

•  sleazy,

•  unsubstantial

•  Antonyms : 

•  sturdy,

•  substantial

2: not composed of matter;

  * e.g., " ... energy is insubstantial "

•  Synonyms : 

•  bodiless,

•  ethereal,

•  formless,

•  immaterial,

•  incorporeal,

•  nonmaterial,

•  nonphysical,

•  spiritual,

•  unbodied,

•  unsubstantial

•  Antonyms : 

•  bodily,

•  corporeal,

•  material,

•  physical,

•  substantial