unmerciless

== English == === Etymology === From un- +‎ merciless (with un- functioning as an intensifier of -less). === Adjective === unmerciless (comparative more unmerciless, superlative most unmerciless) (obsolete) Utterly merciless. === References === “unmerciless”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.