intellectual       
 adjective uk/ˌɪn.təlˈek.tʃu.əl/ us/ˌɪn.t̬əlˈek.tʃu.əl/
B2 智力的,脑力的
relating to your ability to think and understand things, especially complicated ideas
  Looking after a baby at home all day is nice but it doesn't provide much intellectual stimulation. 整天在家照看婴儿虽然不错,但让人不怎么动脑子。 
 I like detective stories and romances - nothing too intellectual. 我喜欢侦探小说和爱情故事——不怎么费脑筋。 
 - More examples
 - His approach to acting is visceral rather than intellectual.
 - While she was at home looking after her children, she felt deprived of intellectual stimulation.
 - Her arguments lacked intellectual rigour.
 - His writing has been dismissed as mere intellectual posturing.
 - Throughout her marriage she never considered her husband as her intellectual equal.
 
intellectual       
noun [ C ] uk/ˌɪn.təlˈek.tʃu.əl/ us/ˌɪn.t̬əlˈek.tʃu.əl/
C2 知识分子,脑力劳动者
a very educated person whose interests are studying and other activities that involve careful thinking and mental effort
  She was too much of an intellectual to find popular movies interesting. 她太书卷气了,认为流行电影没什么意思。