spietelik

Etymology
Compound of

Interjection

 * 1) expresses regret, remorse, or sorrow, sorry.

Usage notes
Normally spietelik is used together with a personal pronoun in the genitive. I'm sorry therefore is miens spietelik or spietelik miens. It is also possible to say miens spiet or spiet miens, what means regret of mine.