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Dictionary.comrue
1   /ru/ Show Spelled Pronunciation [roo] Show IPA Pronunciation ,
verb, rued, ru⋅ing, noun
–verb (used with object)
1. to feel sorrow over; repent of; regret bitterly: to rue the loss of opportunities.
2. to wish that (something) had never been done, taken place, etc.: I rue the day he was born.
–verb (used without object)
3. to feel sorrow, repentance, or regret.
–noun
4. sorrow; repentance; regret.
5. pity or compassion.
Origin:
bef. 900; (v.) ME ruen, rewen, OE hrēowan; c. D rouwen, G reuen; (n.) ME rewe, reowe, OE hrēow; c. D rouw, G Reue; cf. ruth