1. rethe - Adjective
2. rethe - Adverb
(Now chiefly dialectal) (of persons) Fierce; cruel; savage; stern; zealous; ardent; keen.
(Now chiefly dialectal) (of things) Terrible; dreadful; severe.
rethe (comparative rether or more rethe, superlative rethest or most rethe)
(Now chiefly dialectal) Furiously; violently; wildly.