Unbreathable

adj

adj ·Rare ·Advanced level

Definitions

Adjective

1
Not suitable for breathing.
"The atmosphere on Venus is an unbreathable mixture of carbon dioxide and sulphuric acid, amongst other things."
2
Not letting air seep through.
"an unbreathable fabric"

Synonyms

irrespirable unbreatheable

Antonyms

Example

"The atmosphere on Venus is an unbreathable mixture of carbon dioxide and sulphuric acid, amongst other things."

Etymology

From un- + breathable.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.