to remain silent or hold oneself aloof in a sullen, ill-humored, or offended mood: Promise me that you won't sulk if I want to leave the party early. a state or fit of sulking. sulks, ill-humor shown by sulking: to be in the sulks. Also, sulker. a person who sulks.
Some cite the fact that secretions from the millipede repel other insects as a reason why they are beneficial. While millipedes do not bite, the sight of them can still be unnerving, especially when they appear in large numbers. They have the ability to crawl up walls and enter homes through small openings.
Smaller variants of centipedes produce nothing more than a painful, localized reaction, not unlike a bee sting. Larger species, however, administer more venom through a bite and can produce more extreme pain. While centipede bites can be extremely painful, they are not generally fatal to humans.