Similar words: regretful, fretfully, fretful, regret, regrettable, regrettably, tactfully, wistfully. Meaning: [rɪ'gretfʊlɪ] 
adv. with regret (used in polite formulas).
adv. with regret (used in polite formulas). 31. We the editors of the International Journal of Cardiology and Phytotherapy Research regretfully report a case of scientific fraud.
32. Crossed a paragraph again, I tell her tropical fish also died regretfully again.
33. Regretfully Ayub didn " t show satisfaction to Chinese assistance. "
34. " Is it over? " Ke - ting asked regretfully. As he started to rise, the lake burst into light.
35. Now the hall - boy pounded on the door and he released his hold upon her regretfully.
36. Regretfully, I only know this girl's name - Xu Pei - hua .
37. I very regretfully tell you, and your examination is failed.
38. Regretfully, we can't regulate the irregular liner on the gulf.
More similar words: regretful, fretfully, fretful, regret, regrettable, regrettably, tactfully, wistfully, boastfully, doubtfully, thoughtfully, respectfully, distrustfully, forgetful, regress, egregious, segregate, regression, segregated, regressive, desegregate, segregation, regressive tax, at full speed, fully, awfully, carefully, joyfully, ruefully, balefully.