To be unable to think

‘Interesting. That sounds like the English word, ‘blur’.
‘It does.’
‘I wonder how it entered the Thai language.’
This does come from the English word ‘blur’
Blur: difficulty in concentrating due to fatigue or absent-mindedness.
‘Why did you forget to lock the door?’
‘Why can’t you think of an idiom this week?’
Even though this word is English in origin, it must be pronounced on a mid-tone.