One way to hold this word: heartily is doing something with the whole heart put in. The energy is not hidden — you can hear it in the laugh, the greeting, the singing, and you can see it at the dinner table. From that same picture the word can also measure feeling: if the whole heart is in your agreeing or your disliking, then you agree or dislike completely.
From the word’s history
Wiktionary gives Middle English hertely, from Old English ġeheortlīċe 'whole-heartedly, vigorously', equivalent to hearty + -ly. The old sense 'whole-heartedly' sits directly under both modern uses.
來源記載它來自中古英語 hertely，更早是古英文 ġeheortlīċe（全心地、有勁地），等於 hearty 加上 -ly。這個舊意思「全心地」正好同時撐起今天的兩種用法。
Wiktionary entry for 'heartily' (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1018683153:6790)
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