just

What does 'just' here mean?

Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they were perfectly normal, thank you very much. They were the last people you'd expect to be involved in anything strange or mysterious, because they just didn't hold with such nonsense.

In which sense was it used?

just adverb, adjective
BrE / d??st /
NAmE / d??st /
adverb

1 exactly
This jacket is just my size.
This gadget is just the thing for getting those nails out.
Just my luck (= the sort of bad luck I usually have) . The phone's not working.
You're just in time .
~ like… She looks just like her mother.
~ what… It's just what I wanted!
~ as… It's just as I thought.
( BrE ) It's just on six (= exactly six o'clock) .
2 ~ as… at the same moment as
The clock struck six just as I arrived.
3 ~ as good, nice, easily, etc. no less than; equally
She's just as smart as her sister.
You can get there just as cheaply by plane.
4 (only) ~ | ~ after, before, under, etc. sth by a small amount
I got here just after nine.
I only just caught the train.
Inflation fell to just over 4 per cent.
5 used to say that you/sb did sth very recently
I've just heard the news.
When you arrived he had only just left.
She has just been telling us about her trip to Rome.
( especially NAmE ) I just saw him a moment ago.
6 at this/that moment; now
I'm just finishing my book.
I was just beginning to enjoy myself when we had to leave.
I'm just off (= I am leaving now) .
7 ~ about/going to do sth going to do sth only a few moments from now or then
The water's just about to boil.
I was just going to tell you when you interrupted.
8 simply
It was just an ordinary day.
I can't just drop all my commitments.
This essay is just not good enough .
I didn't mean to upset you. It's just that I had to tell somebody.
This is not just another disaster movie—it's a masterpiece.
Just because you're older than me doesn't mean you know everything.
9 only
~ (for sth) I decided to learn Japanese just for fun .
~ (to do sth) I waited an hour just to see you.
There is just one method that might work.
‘Can I help you?’ ‘No thanks, I'm just looking .’ (= in a shop/store)
10 ( informal ) really; completely
The food was just wonderful!
I can just imagine his reaction.
11 used in orders to get sb's attention, give permission, etc.
Just listen to what I'm saying, will you!
Just help yourselves.
12 used to make a polite request, excuse, etc.
Could you just help me with this box, please?
I've just got a few things to do first.
13 could/might/may ~ used to show a slight possibility that sth is true or will happen
Try his home number—he might just be there.
14 used to agree with sb
‘He's very pompous.’ ‘Isn't he just?’