"This" as a demonstrative pronoun:
* "That": If you're talking about something further away, "that" would be the opposite.
* "Those": If you're talking about multiple things further away, "those" would be the opposite.
"This" as a demonstrative adjective:
* "That": Again, if referring to something further away, "that" would be the opposite.
* "These": If referring to multiple things close by, "these" would be the opposite.
"This" as an adverb:
* "There": If referring to a place or direction, "there" could be considered the opposite.
"This" in a broader sense:
* "That": As mentioned before, "that" could be the opposite in general, depending on the context.
* "Other": If you're talking about alternatives, "other" could be the opposite.
* "Not this": This is the most direct opposite, but not always the most helpful in terms of replacing the word.
The best opposite for "this" depends on the specific context. If you can provide an example sentence, I can give you a more precise answer!