IMPAIR v. 4 definitions
ke worse; to diminish in quantity, value, excellence, or strength; to deteriorate; as, to impair health, character, the mind, value. Time sensibly all things impairs. Roscommon. In years he seemed, but not impaired by years. Pope.
BLUNT v.
To repress or weaken, as any appetite, desire, or power of the mind; to impair the force, keenness, or susceptibility, of; as, to blunt the feelings.