insubstantial

/ˌɪnsəbˈstænʃl/ (bre, ipa) · /ˌɪnsəbˈstænʃl/ (ame, ipa) · /ˌin(t)-səb-ˈstan(t)-shəl/ (ame, mw)

insubstantial — adjective

  • insubstantialpositive
  • more insubstantialcomparative
  • most insubstantialsuperlative

1. Something that is insubstantial is too small, thin, weak, or light to be useful,

1.形容詞B2
釋義

Something that is insubstantial is too small, thin, weak, or light to be useful, solid, or meaningful — for example, a meal that does not fill you up, evidence that does not prove anything, or an argument that has little logical support.

例句

The lawyer argued that the evidence against his client was too insubstantial to prove anything.

collocation: insubstantial evidence

Guo found the hotel breakfast insubstantial — only a dry roll and weak coffee.

collocation: insubstantial breakfast / insubstantial meal

同義詞
  • flimsy

    more physical — suggests something breaks or tears easily, e.g. a flimsy chair or a flimsy excuse

  • weak

    broader and less formal; can describe any kind of insufficient strength

  • inadequate

    focuses on not meeting a required standard rather than on structural weakness

反義詞
  • substantial

    the direct opposite; large, strong, or important enough

  • sturdy

    specifically about physical strength and solid construction

  • adequate

    focuses on sufficiency rather than strength

文法句型

be + insubstantial

insubstantial + noun

用法筆記

Commonly modifies nouns whose strength or sufficiency is being judged, such as evidence, argument, meal, basis, foundation, or claim.

常見錯誤

❌The meal was insubstantial for my taste, so I ordered more.
✅The meal was insubstantial
💡I was still hungry after eating it.' — 'insubstantial' describes a factual lack of substance, not a matter of personal preference.
❌He gave an insubstantial speech that lasted two hours.
✅He gave a long but empty speech.
💡'insubstantial' means lacking strength or content, not necessarily short.

2. Something that is insubstantial has no physical body or material form, existing

2.形容詞C1
釋義

Something that is insubstantial has no physical body or material form, existing only as a thought, image, spirit, or effect — for example, a ghostly shape, morning mist, or a fleeting feeling.

例句

The ghostly figure in the film was an insubstantial shape that faded when touched.

collocation: insubstantial shape / insubstantial figure

Lucia said her dream felt real at first but turned insubstantial as she woke up.

predicative use: turn + insubstantial

同義詞
  • intangible

    formal; cannot be touched, often used for ideas, rights, or assets

  • immaterial

    formal or legal; not made of physical matter

  • unreal

    more dramatic; suggests something dreamlike or imagined

反義詞
  • substantial

    direct opposite; having real physical existence

  • material

    made of physical matter; tangible

  • tangible

    able to be touched or felt physically

文法句型

be + insubstantial

insubstantial + noun

用法筆記

Common in literary or descriptive writing. Often collocates with shape, form, figure, shadow, mist, or being — things that have a visual or sensed presence but no tangible body.

常見錯誤

❌His explanation was insubstantial and lacked details.
✅His explanation was weak and lacked details.
💡For arguments or explanations, use sense 1 (weak/insufficient), not sense 2.