opprobrious (adj.) [...] from Latin opprobare "to reproach, taunt,"
from ob "against" (see ob-) + probrum "reproach, infamy." Etymological sense is "disgrace attached to conduct considered shameful." Related: Opprobriously; opprobriousness.

When I first encountered this word, I interpreted ob as a negation/negatory prefix, in opposition to probum. This interpretation is wrong, because it would mean that oppobare meant the opposite of its true meaning.

Prefixes still bedevil and beset me; so please disambiguate the meaning?
Etymonline's separate entry on ob-, states one use 'as an intensive'. However, this use seems unlikely here, because then Etymonline would've have written thus in the entry above.


In the linked entry on ob-, all of the senses (including 'against') are spatial, not logical. Combining the senses listed, it seems that this is:

'reproach' + 'toward, against, across, down, to, about, before, in front of, near' 

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