진짜 - is like true/truly? 진짜 좋아해요! (O) I truly like it! 정말 - really (usually for positive endings) 정말 좋아해요! (O) I really like it! 너무 싫어해요! (O) I really hate it! 너무 - really/excessive/too much. It is suppose to be for negative things/sentences to show that is it too much or excessive. But sometimes Korean will use 너무 with positive endings. However, grammatically speaking, the following is incorrect e.g I heard a mother say to her child wearing a costume, '너무 예뻐!' Really pretty! More info, Level 2 Lesson 16 / Very, A bit, Really, Not really, Not at all / 조금, 아주, 정말, 전혀, 별로, 진짜 http://www.talktomeinkorean.com/lessons/level-2-lesson-16/ Level 3 Lesson 1 / too much or very / 너무 http://www.talktomeinkorean.com/lessons/level-3-lesson-1-too-much-or-very-%EB%84%88%EB%AC%B4/

너무 , 정말, 진짜 너무(too good) - usually used in front of the negative word : 너무 나쁘다 너무 맛없다 ------------------------------------------------------------------------------------------------------------------- 정말(really good) - 정말 맛있다! 정말 감사합니다! - little bit formal 진짜(truly good) - 진짜 맛있다! 진짜 감사합니다! - casual