Where does “unwessched” come from?

unwessched (Middle English) comes from Middle English unwaschen, from English washed — simple past tense and past participle of wash.

Ancestry of “unwessched”, step by step

StepLanguageWordMeaning
1Middle Englishunwaschenunwashen
2Englishwashedsimple past tense and past participle of wash
Every word from English washed →Every word from Middle English unwaschen →