verb ·Rare ·Advanced level

Definitions

Verb

1. 1
   To make dull or duller; to dull. nonstandard, transitive
2. 2
   To become dull or duller; to dull. intransitive, nonstandard

Synonyms

All synonyms

dulldullmuddytarnish

Etymology

From dull + -en.

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