Merriam-Webster Collegiate Dictionary - insensible

 adjective  Etymology: Middle English, from Anglo-French & Latin; Anglo-French, from Latin insensibilis, from in- + sensibilis sensible  Date: 14th century  1. imperceptible dampened by an ~ dew; broadly slight, gradual ~ motion  2. incapable or bereft of feeling or sensation: as  a. not endowed with life or spirit ; insentient ~ earth  b. unconscious knocked ~ by a sudden blow  c. lacking sensory perception or ability to react ~ to pain  3.  a. lacking emotional response ; apathetic, indifferent ~ to fear  b. unaware ~ of their danger  4. archaic stupid, senseless  5. not intelligible ; meaningless  6. lacking delicacy or refinement  • insensibility noun  • ~ness noun  • insensibly adverb