Sentence:  Indeed we should say , on the contrary , that the accident of our later discovery made no difference whatever to the badness of the animal 's pain , that it would have been every whit as bad whether a chance passer-by happened later to discover the body and feel repugnance or <WSD>not</WSD> . 
Meaning of the word marked with <WSD> tags:  negation of a word or group of words