IPA: /ˈɪrɪtəbli/
KK: /ˈɪrɪtəblɪ/
In a way that shows annoyance or impatience.
She spoke irritably when she was interrupted during her presentation.
Irritably → It is formed from "irritare" (meaning to provoke or annoy) and the suffix "-ly" (meaning in a manner of). The word "irritably" describes behaving in a manner that is easily provoked or annoyed.
Think of being easily 'provoked' ('irritare') and how that leads to acting 'in a manner' ('-ly') that shows annoyance.