You may feel that it is worth learning some insulting words in Japanese, but the reality is that most people don't need to learn them. In Japanese, not using polite language may be considered insulting enough by itself. See What is Japanese respect language? See also What is the yagaru verb ending? Go to hell! Literally means "Drop dead! Drop dead, go to hell.
From shinu plus shimau. See What are the chau , cha verb endings? Rude word for "you" see also What are the personal pronouns of Japanese?
A contemptuous expression for a third party. Either extremely rude, or very familiar. Also a rough way of saying "this" or "that". A rough way of saying "you". See also What are the personal pronouns of Japanese? Often changed to temee. See What are itee and sugee? Added as a suffix to other words to make them more contemptuous. See this note. Clueless, dumb, stupid, unaware. See What does boke mean?
Creep, obsessive, nerd. See also What is an otaku? Creepy see also What are these i adjectives kimoi and muzui which aren't in the dictionary? Convert Japanese numbers. Handwritten kanji recognition. Stroke order diagrams. Convert Japanese units.
