Synonym: concentrate, conclude, consider, contemplate, deliberate, expect, gather, guess, imagine, infer, judge, meditate, ponder, reason, study, suppose, suspect, theorize, understand. Similar words: think out, think up, think of, think over, think twice, thin, thing, within. Meaning: [θɪŋk] 
n. an instance of deliberate thinking. v. 1. judge or regard; look upon; judge 2. expect, believe, or suppose 3. use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments 4. recall knowledge from memory; have a recollection 5. imagine or visualize 6. focus one's attention on a certain state 7. have in mind as a purpose 8. decide by pondering, reasoning, or reflecting 9. ponder; reflect on, or reason about 10. dispose the mind in a certain way 11. have or formulate in the mind 12. be capable of conscious thought 13. bring into a given condition by mental preoccupation.
n. an instance of deliberate thinking. v. 1. judge or regard; look upon; judge 2. expect, believe, or suppose 3. use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments 4. recall knowledge from memory; have a recollection 5. imagine or visualize 6. focus one's attention on a certain state 7. have in mind as a purpose 8. decide by pondering, reasoning, or reflecting 9. ponder; reflect on, or reason about 10. dispose the mind in a certain way 11. have or formulate in the mind 12. be capable of conscious thought 13. bring into a given condition by mental preoccupation. 
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(1) Think with the wise, but talk with the vulgar. 
(2) Think much, speak little, and write less.
(3) One may think that dares not speak.
(4) In every beginning think of the end.
(5) I say little but I think the more.
(6) Never think yourself above your business.
(7) Ordinary people merely think how they shall spend their time ; a man of talent tries to use it.
(8) If you don't learn to think when you are young , you may never learn .
(9) A true man and a thief think not the same.
(10) Being reluctant to think , unwilling to study intensively and under-stand deeply and being complacentand satisfied at negligible knowledgeall are the cause of poor intelligence(sentencedict.com/think.html), which can be germed as "foolish".
(11) It is discouraging to think how many people are shocked by honesty and how few by deceit.
(12) The world is comedy to those who think, a tragedy to those who feel.
(13) Think about the misforture of others that you may be satisfied with your own lot.
(14) The fool does think he is wise, but the wise man knows himself to be a fool.
(15) Some persons do first, think afterwards, and then repent for ever.
(16) Think of the devil and he's looking over your shoulders.
(17) Those who have some means think that the most impo rtant thing in the world is love. The poor know that it is money.
(18) He is the wisest man who does not think himself so.
(19) If you do not learn to think when you are young(sentencedict.com), you may never learn.
(20) Why do you weep? Did you think I was immortal?
(21) I don't think I can. --Just try it.
(22) I can't think of a nicer wife for you.
(23) I don't think the rain would last long.
(24) I don't think he's capable of murder.
(25) I think they're starting to get suspicious.
(26) I think it's a load of bull.
(27) 'I don't think so!' she replied tartly.
(28) 'Do you think it will rain?' 'I hope not.'
(29) You can lead a man up to the university, but you can't make him think.
(30) Think all you speak, but speak not all you think.
More similar words: think out, think up, think of, think over, think twice, thin, thing, within, nothing, anything, writhing, clothing, nothing but, something, anything but, breathing, everything, something of, something else, something like, pink, link, blink, link up, shrink, drink up, drink to, sprinkle, drink down, this.