Sentence:  He begged pardon, and was getting into the carriage, but felt he must glance at her once more; not that she was very beautiful, not on account of the elegance and modest grace which were apparent in her whole figure, but because in the expression of her charming face, as she passed close by him, there was something <WSD>peculiarly</WSD> caressing and soft. 
Meaning of the word marked with <WSD> tags:  To greater degree than is usual.