Extensive is a related term of sizeable.
As adjectives the difference between extensive and sizeable
is that extensive is in the nature of an extent, wide, widespread while sizeable is fairly large.
extensive
English
Adjective
(
en adjective)
In the nature of an extent, wide, widespread.
Related terms
* extend
* extent
See also
* intensive
----
sizeable
English
Alternative forms
* sizable