Impeccability
Charles Buck Theological Dictionary [1]
The state of a person who cannot sin; or a grace, privilege, or principle, which puts him out of a possibility of sinning. Divines have distinguished several kinds of impeccability: that of God belongs to him by nature: that of Jesus Christ, considered as man, belongs to him by the hypostatical union; that of the blessed, in consequence of their condition, &c.
Webster's Dictionary [2]
(n.) the quality of being impeccable; exemption from sin, error, or offense.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]
the state of a person who cannot sin, or who, by grace, is delivered from the possibility of sinning. Some speculations have appeared in the world upon the supposed peccability of the human nature of Christ, founded chiefly on certain expressions in the Epistle to the Hebrews ( Hebrews 4:15) and elsewhere, asserting that Christ was "in all points tempted like as we are." It is argued, on, the other hand, that as the Scripture has been silent on this point, it is both needless and presumptuous to attempt to draw any inferences from such expressions as that above cited; and that we should acquiesce in, and be satisfied with, the declaration that "in him is no sin" ( 1 John 3:5). See Art. 15 of Church of England, "Of Christ alone without sin." Impeccability, or, at least, sinless perfection, has also been claimed for every true child of God upon the authority of 1 John 3:9, though improperly, the word "cannot" requiring to be taken (as in many other passages of Scripture) in such a latitude as to express, not an Absolute Impossibility of sinning, but "a strong disinclination," in the renewed nature, to sin "in such a manner and to such a degree as others." — Eden, Theol. Dict. s.v.; Ullmann, Sinlessness of Jesus (Edinb. 1858,12mo), p. 46; Haag, Hist. des Dogmas Chret. (see Index). (See Sinlessness Of Christ); (See Perfection); (See Sanctification).