In a manner requiring or showing great effort; with much exertion or labor.
From effortful + -ly suffix, creating an adverb describing the manner in which something is done. Follows standard English adverbial formation patterns.
This word rarely appears in writing because 'effortfully' sounds clunky—we prefer 'with effort' or 'laboriously'—showing how some grammatically correct words just don't survive because they feel awkward on the tongue.
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