Translation meaning & definition of the word "regretfully" into Spanish language

adverb

1. With regret (used in polite formulas)

• "I must regretfully decline your kind invitation"

synonym:
• regretfully

1. Con arrepentimiento ( usado en fórmulas educadas )

• "Lamentablemente debo rechazar su amable invitación"

sinónimo:
• lamentablemente