Early Noldorin
dadvinn
noun. downhill slope; rash course, impetus, path to destruction
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun in the Early Noldorin Dictionary of the 1920s having the glosses “downhill slope; rash course, impetus, path to destruction”, probably originally a plural of ᴱN. dadvenn “downhill”, but reconceived of as a noun with new plural dadvinniath (PE13/161).