Sentence:  It seems to me that mere unmixed ugliness does not arise from sharp angles, or from any sudden variation, but rather from that "want" of form, that unshapen <WSD>lumpish</WSD> appearance, which, perhaps, no one word exactly expresses; a quality that never can be mistaken for beauty, never can adorn it, and which is equally unconnected with the sublime and the picturesque. 
Meaning of the word marked with <WSD> tags:  Shaped like a lump, lumpy, ill-defined in shape.