If "further" refers to distance:
* Closer: This is the most direct opposite, meaning to be at a shorter distance.
If "further" refers to progress or development:
* Less: This implies a decrease or reduction in progress or development.
* Previous: This indicates something that happened before the current state.
* Regress: This means to move backward or decline.
If "further" refers to addition or continuation:
* Less: This means to reduce or stop adding.
* Stop: This means to cease or end an activity.
Example:
* "I need to investigate this further." The opposite could be "I need to investigate this less." or "I've stopped investigating this."
Ultimately, the best opposite word for "further" depends on the specific context and intended meaning.