Synonyms of the word

insubstantial

• adj. Lacking substance; not real or strong.

aerial

• adj. Living or taking place in the air.
• adj. (now literary or historical) Made up of air or gas; gaseous.
• adj. Positioned high up; elevated.
• adj. Ethereal, insubstantial; imaginary.
• adj. Pertaining to the air or atmosphere; atmospheric.
• adj. Pertaining to a vehicle which travels through the air; airborne; relating to or conducted by means of…
• n. (chiefly Britain) A rod, wire, or other structure for receiving or transmitting radio, television signals…
• n. A move, as in dancing or skateboarding, involving one or both feet leaving the ground.
• n. (photography) Aerial photography.

aeriform

• adj. Pertaining to air.
• adj. Having a form similar to that of air.
• adj. Light, unsubstantial, or unstable.

aery

• n. Alternative form of eyrie.
• n. Alternative form of aerie.
• adj. (poetic) aerial; ethereal; incorporeal; visionary.

airy

• adj. Consisting of air.
• adj. Relating or belonging to air; high in air; aerial.
• adj. Open to a free current of air; exposed to the air; breezy.
• adj. Resembling air; thin; unsubstantial; not material; airlike.
• adj. Relating to the spirit or soul; delicate; graceful.
• adj. Without reality; having no solid foundation; empty; trifling; visionary.
• adj. Light of heart; vivacious; sprightly; flippant; superficial.
• adj. Having an affected manner; being in the habit of putting on airs; affectedly grand.
• adj. (painting) Having the light and aerial tints true to nature.

ethereal

• adj. Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the…
• adj. Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy,…
• adj. Delicate, light and airy.
• adj. (chemistry) To do with ether.

immaterial

• adj. Having no matter or substance.
• adj. (law, accounting) So insubstantial as to be irrelevant.

jejune

• adj. Not nutritious.
• adj. Lacking matter; empty; devoid of substance.
• adj. Naive; simplistic.

nonmaterial

• adj. Not material; apart from matter.

shadowy

• adj. In shadow; darkened by shadows.
• adj. (of character) Dark, obscure.

stringy

• adj. Composed of, or resembling, string or strings.
• adj. (of a person) Wiry, lean, scrawny.
• adj. (programming, informal) Resembling or involving text strings.

unreal

• adj. fake; not real.
• adj. (slang) larger or more fantastic than typical of real life.

unsubstantial

• adj. (archaic) Alternative form of insubstantial.

unwholesome

• adj. Not wholesome; unfavorable to health; unhealthy.
• adj. Not sound; diseased; tainted; impaired; defective.
• adj. Indicating unsound health; characteristic of or suggesting an unsound condition, physical or mental; repulsive;…

wraithlike

• adj. Resembling a wraith; ghostly.