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REGRETFULLY/REGRETTABLY |

Either word can be used as an adverb to introduce an expression of
regret, though conservatives prefer “regrettably” in sentences like
“Regrettably, it rained on the 4th of July.” Within the body of a
sentence, however, “regretfully” may be used only to describe the manner
in which someone does something: “John had to regretfully decline his
beloved’s invitation to go hang-gliding because he was terrified of
heights.” If no specified person in the sentence is doing the
regretting, but the speaker is simply asserting “it is to be regretted,”
the word is “regrettably”: “Their boss is regrettably stubborn.”