Here's why:
* Synonym: "Decided" means "firmly resolved" or "made up one's mind". A synonym might be "resolved", "determined", or "certain".
* Antonym: The opposite of "decided" would be "undecided", "hesitant", or "uncertain".
* Homophone: This means a word that sounds the same but is spelled differently and has a different meaning.
Let's try to get close:
* "Diss-ided" This sounds like "decided" but doesn't exist as a word. It's a playful invention that *could* be interpreted as the opposite of "decided" in some contexts.
The Bottom Line: There is no perfect single word that fits all three criteria. It's a fun linguistic puzzle!