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insubstantial (adj.)

c. 1600, from Medieval Latin insubstantialis "not substantial," from in- "not" (see in- (1)) + Late Latin substantialis "having substance or reality, material," in Late Latin "pertaining to the substance or essence," from substantia "being, essence, material" (see substance). Related: Insubstantially.

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Definitions of insubstantial from WordNet

insubstantial (adj.)
lacking material form or substance; unreal;
as insubstantial as a dream
an insubstantial mirage on the horizon
Synonyms: unsubstantial / unreal
insubstantial (adj.)
lacking in nutritive value;
an insubstantial and unsatisfying meal
insubstantial (adj.)
lacking solidity or strength;
vinyl siding has become the standard-bearer for cheap, insubstantial construction
Synonyms: flimsy
From wordnet.princeton.edu