mirthful

the word 'mirthful' is a compound formed from two old english elements. the root 'mirth' descends from the old english myrgþ, which itself evolved from the proto-germanic murgiþō, conveying a sense of joy, pleasure, or gladness. this is cognate with old norse myrgð and is related to the old english adjective myrge, meaning 'pleasant'. the suffix '-ful' is the modern form of the old english adjectival suffix -ful, meaning 'full of' or 'characterized by'. thus, the literal construction 'full of mirth' directly and transparently yields the modern meaning of being merry, joyful, or inclined to laughter.

Structure: mirth (joy) + ful (full of) mirth (from old english myrgþ, meaning joy, pleasure, of germanic origin) + ful (from old english -ful, an adjective-forming suffix meaning 'full of').