Hypertext Webster Gateway: "regretfully"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Regretful \Re*gret"ful\ (-f?l), a.
Full of regret; indulging in regrets; repining. --
{Re*gret"ful*ly}, adv.
From WordNet (r) 1.7 (wn)
regretfully
adv : with regret (used in polite formulas); "I must regretfully
decline your kind invitation"
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