adj, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any substance that is not flammable.

Adjective

1. 1
   Not capable of catching fire and burning; not flammable.

   "The ash represents the more incombustible mineral matter, usually of the nature of clay or slate."

Adjective

1. 1
   not capable of igniting and burning wordnet

Synonyms

All synonyms

inflammablenoncombustiblenoncombustibleuncombustibleuninflammableuninflammable

Antonyms

All antonyms

combustibleflammableinflammable

Example

More examples

"The ash represents the more incombustible mineral matter, usually of the nature of clay or slate."

Etymology

From in- + combust + -ible.

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