What is antonym of abc?

There isn't a direct antonym for "ABC" in the same way there is for words like "hot" and "cold." "ABC" refers to the basic alphabet, so it's more about a concept than a word with a direct opposite.

However, depending on the context, you could consider these as possible "opposites" in a metaphorical sense:

* Complexity: ABC represents simplicity, so complexity could be considered its opposite.

* Advanced knowledge: ABC represents basic knowledge, so advanced knowledge or expertise could be seen as the opposite.

* Z to A: If "ABC" represents the beginning of the alphabet, "Z to A" could be considered its opposite, signifying the end.

Ultimately, the best "antonym" depends on the specific context in which "ABC" is being used.