When you're peevish, you're easily irritated and grumpy. Everything seems to get under your skin.
Know someone who always seems annoyed, grumpy, cranky, or irritated? That person is peevish. Some people are peevish in general, but most people can be peevish about certain subjects — we all have a pet peeve. Lots of people get peevish about language: like using the word like all the time as verbal filler. Being peevish is almost always considered a form of pettiness — it's not a good thing. When you're peevish, you're not really looking at the big picture.