regretful

regret +‎ -ful

regretful (comparative more regretful, superlative most regretful)

1. Full of feelings of regret, indulging in regrets.
2. Sorrowful about what has been lost or done.

• (full of regret): repining, rueful, sorrowful

• regretfully
• regretfulness
• unregretful

• regretful in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• regretful in The Century Dictionary, New York, N.Y.: The Century Co., 1911.