bright : 口语常用词，多指年轻人，尤指小孩思路敏捷，理解力强，机灵等。
- They were bright children, always asking questions.
- She was enthusiastic and full of bright ideas and suggestions.
clever : 强调头脑灵活，接受新事物快，有智有谋，但不一定暗示全面妥当地考虑问题。
- Judy has never been very clever, but she tries hard.
- Fiona is very clever at physics.
- Charlie has a clever idea/plan for getting us out of our present difficulties.
wise : 侧重不是一般的聪明伶俐，而是有远见，有智慧，能明智地处理问题。
- I think you made a wise choice.
- "I never drink more than three glasses of wine." "How wise."
- Looking at the weather, I think we made a wise decision not to go to the coast this weekend.
- I think it would be wiser to wait and see how much money you have left before you make any decisions.
- I never used to save money but now I'm a little older and wiser I can see the point of it.
- Was it Thomas More who said that the wise man learns from the experience of others?
brilliant : 指人的才华出众，思路敏捷，常令人赞叹不已。
- Her mother was a brilliant scientist.
- He gave a brilliant performance.
- The idea was quite brilliant.
- She seemed to have a brilliant career ahead of her (= was likely to be extremely successful).
intelligent : 正式用词，指在理解新的、抽象东西或处理解决问题时，智力超过一般常人。
- a highly intelligent young man
- an intelligent remark
- Helen had a few intelligent things to say on the subject.
ingenious : 指思路敏捷，并暗示有创造与发明的才能和技巧。
- an ingenious idea/method/solution
- Gautier's solution to the puzzle is ingenious.
- Johnny is so ingenious - he can make the most remarkable sculptures from the most ordinary materials.
smart : 普通用词，与bright和clever的意思很相近，但更强调机灵。
- Maddy's teacher says she's one of the smartest kids in the class.
- Why don't you fix it if you're so smart?
- I'm not smart enough to understand computers.
- He's smart enough to know he can't run the business without her.
- Quitting that job was the smartest move I ever made.
shrewd : 指精明老练，有头脑，善于判断，把握有利机会。
- He was shrewd enough not to take the job when there was the possibility of getting a better one a few months later.
- She is a shrewd politician who wants to avoid offending the electorate unnecessarily.
- It was a shrewd move to buy your house just before property prices started to rise.