Having no knowledge or cognizance of a particular fact, thing, etc.; not knowing, unaware, unconscious; hence, unheeding, regardless. Sometimes…

Unaware, ignorant. Const. of, that.

Lacking knowledge or understanding of something; ignorant of.

With of (also about, to): having no knowledge or awareness of the thing specified; (hence) †innocent of, having no share in (obsolete).

In quasi-adjectival use. Ignorant, not aware, of something. Obsolete. (Cf. unaware, adv. 1.)

(un-, prefix1 affix 2b.)

Having no knowledge or understanding of something. rare.

Not having studied; unversed (in something).

Predicatively, a stranger to ——: Unacquainted with, ignorant of. (Distinct from sense 4.) Ignorant of (an art, a language, etc.). Obsolete.

Not having knowledge or awareness of a fact or circumstance; unaware, heedless; unwitting. With of.

Not having knowledge or awareness of a fact or circumstance; unaware, heedless; unwitting. With subordinate clause. Now somewhat archaic.

Not skilled or expert in something; ignorant of; untrained or unable to.

Unaware or unconscious of. With of, to. (Now the usual sense.)