żal.

grief, regret, sorrow (emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing)

żal po czyjejś śmierci

grief, regret, sorrow (remorse after committing something wrong)

żal za grzechy

grievance, grudge (animosity or ill will against someone or something caused by disappointment)

żal do ojca

complaints, grievances, lamentations, regrets (statements in which someone laments or complains about something)

wysłuchiwać żalów

żale (lyrical work in Old Polish literature expressing complaints about fate, pain due to some misfortune, or grief after someone's death)

to grieve, to pity (to feel sympathy for someone; to feel sorry for someone)

Żal mi jego dzieci.

to regret (to feel sadness about something one has or has not done, or about what has passed and what one has lost)

Żal nam stąd wyjeżdżać, ale mamy pełno rzeczy do zrobienia u siebie.

to have a sense of wasting something that is important and valuable, and which one would like to see put to good use

Żal mi czasu na dyskutowanie z tobą, i tak nie zrozumiesz.