Unable and Unprotected

Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.

Unprotected and unable are semantically related. in defenceless topic. In some cases you can use "Unprotected" instead an adjective "Unable".

Unprotected adjective - Lacking protection from danger or resistance against attack.

Unable and unprotected are semantically related. Sometimes you can use "Unable" instead an adjective "Unprotected".