As adjectives the difference between updatable and undatable
is that updatable is (computing) that can be updated while undatable is not able to be dated; that may be not be ascribed a date (or age).
updatable
English
Alternative forms
* updateable
Adjective
(-)
(computing) That can be updated.
undatable
English
Alternative forms
* undateable
Adjective
(-)
Not able to be dated; that may be not be ascribed a date (or age).
Not dateable; unsuitable for romantic outings; unattractive.