Where does “unslated” come from?

unslated (English) comes from English slated, from English -ed, from Middle English -ed, from Old English -ed — formed into the likeness of, made into, shaped...

unslated (English): Not fitted with slates

Definitions

  1. Not fitted with slates

Ancestry of “unslated”, step by step

unslated traces back through two separate lines of ancestry.

via English slated

StepLanguageWordMeaning
1Englishslatedscheduled; simple past tense and past participle...
2English-edUsed to form past tenses of verbs. In...
3Middle English-edAlternative form of -hede
4Old English-edformed into the likeness of, made into, shaped...

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Old English -edEvery word from English -edEvery word from Middle English -ed