From BiblePortal Wikipedia

King James Dictionary [1]

Unworthy, a.

1. Not deserving followed by of. As sinners, were are utterly unworthy of the divine favor. 2. Not deserving wanting merit. Receive your unworthy son into favor. One great evil of government is that unworthy men are elected or appointed to fill important offices. 3. Unbecoming vile base as unworthy usage or treatment. 4. Not suitable inadequate. This opinion is unworthy of its author.

Webster's Dictionary [2]

(a.) Not worthy; wanting merit, value, or fitness; undeserving; worthless; unbecoming; - often with of.