Where does “toor” come from?

toor (Middle English) comes from Old Norse tor-, from Proto-Germanic tuz-, from Proto-Indo-European dus-, from Proto-Indo-European dēwǝ- — to fail, be behind, be lacking.

Ancestry of “toor”, step by step

StepLanguageWordMeaning
1Old Norsetor-hard, difficult, wrong, bad; hard, difficult
2Proto-Germanictuz-bad
3Proto-Indo-Europeandus-bad
4Proto-Indo-Europeandēwǝ-to fail, be behind, be lacking
Every word from Proto-Indo-European dēwǝ- →Every word from Proto-Indo-European dus- →Every word from Old Norse tor- →