General:
* Broad
* Expansive
* Spacious
* Ample
* Extensive
* Large
* Big
Describing physical dimensions:
* Broad
* Large
* Vast
* Immense
* Extensive
* Unbounded
Describing range or scope:
* Comprehensive
* Extensive
* Broad
* Diverse
* Multifaceted
Describing an opening:
* Open
* Unconfined
* Gaping
Other synonyms:
* Unrestricted
* Unbound
* Unlimited
* Widespread
* General
* Inclusive
It's helpful to provide more context about how you're using "wide" to get the most accurate synonyms. For example, are you talking about the width of an object, the scope of a topic, or something else entirely?