IPA: /ˈtɛtʃi/
KK: /ˈtɛtʃi/
Very irritable or easily annoyed; the most irritable or easily annoyed.
She was in a tetchiest mood after a long day at work.
Comparative: tetchier
Superlative: tetchiest
Tetchiest → It is formed from "tetchy" (from the dialectal form of "touchy", meaning easily irritated) and the suffix "-est" (indicating the superlative degree). The word "tetchiest" means the most easily irritated or sensitive.
Think of someone who is the 'most easily irritated' — 'tetchy' means touchy or sensitive, and '-est' shows that it's the highest degree.