Where does “sniffeth” come from?

sniffeth (English) comes from English sniff, from Middle English sniffen.

sniffeth (English): Third-person singular simple present indicative...

Definitions

  1. Third-person singular simple present indicative...

Ancestry of “sniffeth”, step by step

sniffeth traces back through two separate lines of ancestry.

via English sniff

StepLanguageWordMeaning
1EnglishsniffTo make a short, audible inhalation, through the...
2Middle Englishsniffen

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Middle English sniffenEvery word from English sniff