Numb
Part of speech: verb
Definition: To cause to become numb.
Part of speech: adjective
Definition: Without the power of sensation and motion or feeling; insensible.
Example sentence: A sensitive person is seldom happy with the world the way it is. And since you cannot change it, you think, 'Might as well numb the anguish.' If you're using something to escape reality, then it's something you need to address.
Insensitive
Part of speech: adjective
Definition: not having normal physical feelingnot having normal emotional feelings, cold, tactless, undiplomatic
Example sentence: I personally find it difficult to accept that there could be anyone on earth insensitive to the comic abilities of Laurel and Hardy, Sid Caesar, Woody Allen, Mel Brooks, or Martin Short. But no matter who the comic entertainer is, there is always at least a minority prepared to say, 'What's all the excitement about? He doesn't seem funny to me.'