Comparative form of slight: more slight (adjective)
One who slights. (noun)
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Use "slighter" in a sentence
"It was in the repressed scenes, where the melancholy was sincere, the feeling deeper, and the expression slighter, that he was at his best."
"The smaller the similarity pointed out the slighter is the chain which connects the distant objects, and the less we are inclined to laugh."
"And the higher and purer the original object, and the more unselfishly it may have been taken up, the slighter is the probability that they can be led to recognize the process by which godlike benevolence has been debased into all-devouring egotism."