1. 思考,沈思：coexist 共生,共存 | cogitate 思考,沈思 | cohere 凝结,结合

2. 思考：cogitable 可以思考的 | cogitate 思考 | cogitation 沉思

3. 深思：incogitant考虑不周的 | cogitate,深思 | incongruent不协调动

4. 思考/考虑：cogitable /可以思考的/可做思考题目的/ | cogitate /思考/考虑/ | cogitation /熟考/思考/考虑/

1. 仔细考虑;深入考虑
If you are cogitating, you are thinking deeply about something.

e.g. He sat silently cogitating.
他静静地坐着沉思。
e.g. ...to cogitate on the meaning of life.
认真思考生命的意义

verb

1. use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

e.g. I've been thinking all day and getting nowhere

Synonym: thinkcerebrate

2. consider carefully and deeply
reflect upon
turn over in one's mind