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regretfully
01
used to express a sense of sorrow or remorse
Example
Regretfully, the error in the report was not noticed until after its distribution.
I regretfully informed them that the reservation had to be canceled due to unforeseen circumstances.
Regretfully, we have to inform you that the event has been canceled due to unforeseen circumstances.
She regretfully accepted that the project would need additional time to meet the desired quality standards.
The company regretfully declined the proposal to partner with the startup.
