adj not sensible or reasonable; meaningless.
2. insensible ·adj destitute of the power of feeling or perceiving; wanting bodily sensibility.
3. insensible ·adj incapable of being perceived by the senses; imperceptible. hence: progressing by imperceptible degrees; slow; gradual; as, insensible motion.
4. insensible ·adj not susceptible of emotion or passion; void of feeling; apathetic; unconcerned; indifferent; as, insensible to danger, fear, love, ·etc.;
often used with of or to.