IPA: /ˈtɛtʃɪli/
KK: /ˈtɛtʃɪli/
In a way that shows annoyance or irritation.
She responded tetchily when asked about her plans.
Tetchily → It is formed from "tetchy" (of uncertain origin, possibly from the dialectal term 'tetch', meaning touchy or irritable) and the suffix "-ly" (meaning in a manner of). The word "tetchily" means in a manner that is irritable or touchy.
Think of someone being 'touchy' or easily irritated, and remember that 'tetchily' describes acting in that irritable manner.