心思

His mind is elsewhere/on something else.

wicked idea

open one's mind to sb

gain an insight into sb's mind

read sb's heart/mind

recollect one's mind/thoughts; concentrate (on)

expend much thought/care (on)

cannot figure out what sb is thinking about; cannot read sb's mind

do a lot of thinking; think hard

rack one's brains (for sth/to do sth)

bother one's head for nothing; rack one's brains in vain

I am not in a humour for joking.

Hot weather indisposes a person to work.

He shows no interest whatsoever in my nagging.

His heart is not in study. / He is not in the right frame of mind for study.

be in no mood for dancing/anything

have a strong disinclination to do anything

feel indisposed to study