a good teacher is someone who is outgoing, kind, and patient. also, a good teacher makes learning so much fun that you don't realize you are actually learning!

As a teacher I often ask my students at the start of the year this same question. Every year I get the same answers. A good teacher is one who: 1. Knows their subject matter and presents it in an interesting way. 2. Deals fairly with all students without favouritism. 3. Can take a joke and can laugh with students at his/her own mistakes. 4. Doesn't hold grudges. 5. Is not prejudiced against any races or religions. 6.When they don't know the answer to a question will admit it and say, 'Let's find out'. 7. Makes allowances for students who've just returned from illness, bereavement etc

That's a GOOD question! I agree that a teacher needs to inspire and motivate students through interesting lessons, patience and clear explanations as others have said. However, 'fun' and 'knowing something useful' every lesson suggests the student relies too much on the teacher. A teacher is only as good as the student - which means, students need to take responsibility for their learning. Some things cannot be learned in a single lesson, and some things just aren't fun to learn! Entertainment is NOT the key to your success if you are studying a language, practice is. A good teacher knows when students need to progress (do something difficult) and when they need consolidation (repeat something they have already learned). You can have fun doing both of these things, but students who measure how good their teacher is by how much fun they have are confusing teachers with entertainers. What's important is that the teacher is knowledgeable, helpful and has the ability to explain things clearly. I say this as both a teacher (of English) and a learner (of Thai) of long experience.

one thing is the knowledge and another thing is character, character is more important thing . there's also important that ability of adapt society.

Every time you end a lesson or conversation with a good teacher, you will know something useful that you haven’t known before. When a good teacher teaches you something, you will feel that you have realised it all by yourself. And when you make someone understand something that you don’t understand, that’s when you become a spiritual leader. :D