'almost impossible' versus 'very painful'

[Echtine]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", question 5

It's like hitting your head against a brick wall trying to get him to see sense because he takes no notice.

(a) very painful
(b) almost impossible
(c) almost damaging
(d) very hurtful

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", answer 5

It's almost impossible trying to get him to see sense because he takes no notice.

Correct answer: (b) almost impossible
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almost impossible versus very painful

Echtine

[Conchita]

'Almost impossible' means that it almost can't be done.

'Very painful' is something that can be done, but in a way which hurts.