Antonyms of adj insubstantial

2 senses of insubstantial

Sense 1
insubstantial (vs. substantial), unsubstantial, unreal -- (lacking material form or substance; unreal; "as insubstantial as a dream"; "an insubstantial mirage on the horizon")

substantial (vs. insubstantial), real, material -- (having substance or capable of being treated as fact; not imaginary; "the substantial world"; "a mere dream, neither substantial nor practical"; "most ponderous and substantial things"- Shakespeare)

Sense 2
insubstantial, jejune -- (lacking in nutritive value; "the jejune diets of the very poor")

INDIRECT (VIA unwholesome) -> wholesome -- (conducive to or characteristic of physical or moral well-being; "wholesome attitude"; "wholesome appearance"; "wholesome food")

Similarity of adj insubstantial

2 senses of insubstantial

Sense 1
insubstantial (vs. substantial), unsubstantial, unreal -- (lacking material form or substance; unreal; "as insubstantial as a dream"; "an insubstantial mirage on the horizon")
       => aeriform, aerial, airy, aery, ethereal -- (characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle; "aerial fancies"; "an airy apparition"; "physical rather than ethereal forms")
       => shadowy, wraithlike -- (lacking in substance; "strange fancies of unreal and shadowy worlds"- W.A.Butler; "dim shadowy forms"; "a wraithlike column of smoke")
       => stringy -- (consisting of or containing string or strings)
          Also See-> immaterial#3, nonmaterial#1

Sense 2
insubstantial, jejune -- (lacking in nutritive value; "the jejune diets of the very poor")
       => unwholesome (vs. wholesome) -- (detrimental to physical or moral well-being; "unwholesome food"; "unwholesome habits like smoking")