Where the prefix retro- does not merely "reverse" the existing condition (which would already be the opposite e.g. retro-rocket), the opposite would be pro- (proactive, progressive, prograde, and prospective).
The prefix is -in, as in "incapable."
The prefix of the word retroperitoneum is "retro-," which means behind, backwards, or on the other side.
The antonym for alcoholic with the prefix "non-" added is "nonalcoholic."
The prefix that means "backwards" is "retro-".
The prefix "ir-" before "regular" would create the antonym "irregular."
The prefix is -in, as in "incapable."
The prefix of the word retroperitoneum is "retro-," which means behind, backwards, or on the other side.
Periton- is the root and retro- the prefix for retroperitoneal.
The antonym for alcoholic with the prefix "non-" added is "nonalcoholic."
Retro, or perhaps anti in some cases, such as anticlockwise.
The prefix that means "backwards" is "retro-".
prefix
Backwards, or back in time.
retrospect retrograde
retro
The prefix "ir-" before "regular" would create the antonym "irregular."
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