Hardly
We use hardly meaning 'not very much' or 'minimally':
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I am so tired I can hardly concentrate. (my concentration is minimal)
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I can hardly see anything without my glasses. (I can't see much)
Hardly is used as a negative word, so the verb cannot be negative:
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I can hardly understand.
I can't hardly understand
Almost
We use almost to say something is very close to being something else:
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I exercise almost every day. (not every day, but very close to it)
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Susan is almost 6 foot tall. (she is not 6 feet, but very close to it)
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The building is almost finished. (it is very close to being finished)
Just
We can use just meaning 'exactly':
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That is just what we need now. (exactly what we need)
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The new manager is just as arrogant as the previous one.
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We are putting the finishing touches to make the party just perfect.