In a way that uses great strength, energy, or emphasis; powerfully or with force.
From 'force' (Old French 'force,' from Latin 'fortis' meaning strong), plus the adverb suffix '-fully.' The word chain shows how strength and power traveled from Latin through French into English.
The word 'forcefully' is itself forceful—it has hard consonants that make you almost spit out the word, which is a cool example of sound matching meaning!
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