* Offensive: The opposite of offensive would be inoffensive, polite, or respectful.
* Affable: The opposite of affable would be unfriendly, distant, or unapproachable.
* Synergetic: The opposite of synergistic would be antagonistic, disruptive, or counterproductive.
* Zealous: The opposite of zealous would be apathetic, indifferent, or lackadaisical.
Therefore, the closest opposite of the phrase "offensive affable synergetic zealous" would be something like "inoffensive, unfriendly, antagonistic, and apathetic."
This combination paints a picture of someone who is not only harmless and polite but also distant, actively working against others, and showing no passion or enthusiasm.