DictionaryinsubstantialLacking solidity
adjective

insubstantial

in-sub-STAN-shuhl/ˌɪnsəbˈstænʃl/

Without enough solid substance to have weight.

The insubstantial cardboard chair buckles beneath the weight of a small book.

A flimsy chair made from thin cardboard sags and buckles beneath a single small closed book, showing its lack of strength and solidity.
Etymology

The negative prefix denies substance or reality. This can describe something without physical solidity, or figuratively something lacking the real content or importance that would give it weight.

In context

Enhanced Public Domain138:04
the word head or the word cut which is a universal we feel such words to be incomplete and insubstantial they seem to demand a context before anything can be done with them
1910s Philosophy: Bertrand Russell - The Problems of Philosophy (Audiobook)

More examples

  • The curtains are so insubstantial that every breeze lifts them.
  • An insubstantial lunch leaves me hungry all afternoon.
  • Her objections seem insubstantial beside the benefits of the plan.

Forms

insubstantial

insubstantiality noun — The quality of lacking solid substance.

Similar words

flimsy
Emphasizes weak construction rather than a lack of substance.
ethereal
Suggests an airy, delicate quality rather than insufficient substance.