Other forms: disregarded; disregarding; disregards
If everyone at the city council meeting tends to disregard anything that's said by the eccentric gentleman with the parrot on his shoulder, it means that no one pays any attention to him.
To disregard something is to ignore it, or to deliberately pay it no attention. Sometimes the word is used to mean "neglect," implying that something important is not being taken care of. Disregard can also be a noun; you could complain that your family has a complete disregard for your privacy when they gather outside your bedroom door to eavesdrop on your telephone conversations.