unmerciless

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• Unmerciless — Un*mer ci*less, a. [Pref. un (intensive) + merciless.] Utterly merciless. [Obs.] Joye. [1913 Webster] …   The Collaborative International Dictionary of English

• Un- — [OE. & AS. un ; akin to OFries. un , D. on , OS., OHG., & G. un , Icel. [=o] , [=u] , Sw. o , Dan. u , W. an , L. in , Gr. ?, ?, Skr. an , a . [root]193. Cf. {A } not {In } not, No, adv.] An inseparable prefix, or particle, signifying not; in ;… …   The Collaborative International Dictionary of English