For specific objects:
* This (when referring to something close)
* That (when referring to something farther away)
* These (for multiple objects close)
* Those (for multiple objects farther away)
For general concepts:
* A/an (if the noun is singular and unspecific)
* Some (if the noun is plural and unspecific)
* Any (if the noun is general and not specific)
For emphasis:
* Very
* Particular
* Specific
For other situations:
* Same
* Said (as in "the said document")
* Aforementioned
It's important to consider the specific meaning and context when choosing a synonym for "the."