Where does “cuspless” come from?

cuspless (English) comes from English less, from Middle English les, from Old English lēas, from Proto-Germanic *laus.

cuspless (English): Without a cusp or cusps

Definitions

  1. Without a cusp or cusps

Ancestry of “cuspless”, step by step

cuspless traces back through two separate lines of ancestry.

via English less

StepLanguageWordMeaning
1EnglishlessTo a smaller extent or degree; comparative form...
2Middle Englishlesfalse; lying; deceptive; falsehood; a lie
3Old Englishlēasfalse, lax; false, void, loose; devoid of, loose...
4Proto-Germanic*laus

via English cusp

StepLanguageWordMeaning
1EnglishcuspA sharp point or pointed end; An important moment...
2Latincuspispoint, tip; spit; sting
3Proto-Indo-Europeanspey-sharp point, stick
Every word from Proto-Germanic *laus