past tense and past participle of 1think
noun
plural thoughts
[count] :an idea, plan, opinion, picture, etc., that is formed in your mind :something that you think of
[noncount] :the act or process of thinking
[noncount] :the act of carefully thinking about the details of something
[singular] :the act of thinking about the feelings or situations of other people
[noncount] :a way of thinking that is characteristic of a particular group, time period, etc.
(a) penny for your thoughts
food for thought
perish the thought