In an earthy manner; with earthiness, practicality, or coarse frankness.
From 'earthy' plus the adverbial suffix '-ly'. Derives from 'earth' with medieval sense-development making 'earthy' mean practical, sensual, or bluntly honest.
'Speaking earthily' means talking plainly without pretense—it's the language of farmers and workers throughout history, and Shakespeare made 'earthy' language famous by having his most beloved characters speak it most naturally.
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