Is there a word that reflects the opposite of hyperbole (since "hypobole" is sadly not a real word)?
I would suggest:
Presented or expressed in a subtle and effective way.
‘It has that rare and refreshing eloquence of the understated.’
‘Subtlety is the foremost element in this suavely written and understated novel.’
‘His understated comedy, often just a subtle facial expression, was deeply funny to millions.’
as a noun you can say "understatement"
The presentation of something as being smaller or less good or important than it really is.
‘a master of English understatement’