The word, meaning originally to seize upon or lay hold of, occurs frequently in the New Testament in different phases of this original sense. Thus, to apprehend or grasp, Eph 3:18; Phi 3:12, Phi 3:13; Rom 9:30 : of seizure by a demon, Mar 9:18 : of something coming upon or overtaking, Joh 12:35; 1Th 5:4 : of comprehending, grasping mentally, as here, Act 10:34; Act 25:25.
Unlearned (ἀγράμματοι)
Or, very literally, unlettered. With special reference to Rabbinic culture, the absence of which was conspicuous in Peter's address.
Ignorant (ἰδιῶται)
Originally, one in a private station, as opposed to one in office or in public affairs. Therefore one without professional knowledge, a layman; thence, generally, ignorant, ill-informed; sometimes plebeian, common. In the absence of certainty it is as well to retain the meaning given by the A. V., perhaps with a slight emphasis on the want of professional knowledge. Compare 1Co 14:16, 1Co 14:23, 1Co 14:24; 2Co 11:6.