Where does “unsped” come from?

unsped (English) comes from English sped — simple past tense and past participle of speed.

unsped (English): Not performed; not dispatched

Definitions

  1. Not performed; not dispatched

Ancestry of “unsped”, step by step

unsped traces back through two separate lines of ancestry.

via English sped

StepLanguageWordMeaning
1Englishspedsimple past tense and past participle of speed

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from English sped