Whats a word for someone who thinks everything is easy? [closed]
Some words which you may be looking for (in order of their rank):
smart-arse = someone who is always trying to seem more clever than other people in a way that is annoying
egomaniac = someone who considers themselves to be very important and able to do anything that they want
smart-alec = someone who tries to appear clever or who answers questions in a clever way that annoys other people
egotistic = considering yourself to be better or more important than other people
know-all = a person who thinks that they know much more than other people
Reference: Cambridge Dictionary
Apologies for providing the words and their meanings from a British English dictionary even after seeing your American English tag.