Noah Webster's Dictionary 1. (a.) Unable to move or act; not reactive with other elements; as, an inert gas will not ignite. 2. (a.) Indisposed to move or act; very slow to act; sluggish; dull; inactive; indolent; lifeless. 3. (a.) Not having or manifesting active properties; not affecting other substances when brought in contact with them; powerless for an expected or desired effect.

Multi-Version Concordance Inert (1 Occurrence) 2 Peter 1:8 for these things being to you and abounding, do make 'you' neither inert nor unfruitful in regard to the acknowledging of our Lord Jesus Christ, (YLT)