adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   spontaneous; voluntary archaic

Synonyms

All synonyms

acquiescent

Etymology

From Latin ultroneus, from ultro (“to the further side, on his part, of one's own accord”). See ultra-.

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