Regretfully definitions

Regretfully

1) Contritely 2) Diffidently 3) Remorsefully 4) Repentantly 5) Ruefully 6) With regret
Found on https://www.crosswordclues.com/clue/regretfully

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Regretfully

1) Pensively 2) Ruefully
Found on https://www.crosswordclues.com/clue/regretfully

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regretfully

[adv] - with regret (used in polite formulas)
Found on http://www.webdictionary.co.uk/definition.php?query=regretfully

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regretfully

adverb with regret (used in polite formulas); `I must regretfully decline your kind invitation`
Found on https://www.encyclo.co.uk/local/20974

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