Merciful
来自Big Physics
Middle English: from Old French merci ‘pity’ or ‘thanks’, from Latin merces, merced- ‘reward’, in Christian Latin ‘pity, favour, heavenly reward’.
wiktionary
From Middle English merciful, mercyful, equivalent to mercy + -ful.
etymonline
merciful (adj.)
"exercising forbearance or pity; characterized by mercy, giving relief from danger, need, or suffering," mid-14c., from mercy + -ful. The earlier word was merciable (c. 1200). Related: Mercifully; mercifulness.
