UNMERCIFUL
merciless, unmerciful
(adjective) having or showing no mercy; “the merciless enemy”; “a merciless critic”; “gave him a merciless beating”
Source: WordNet® 3.1
Etymology
Adjective
unmerciful (comparative more unmerciful, superlative most unmerciful)
not showing mercy
Synonyms
• merciless
Antonyms
• merciful
Source: Wiktionary
Un*mer"ci*ful, a.
Definition: Not merciful; indisposed to mercy or grace; cruel; inhuman;
merciless; unkind.
– Un*mer"ci*ful*ly, adv.
– Un*mer"ci*ful*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition