Sentence:  The half-dozen pieces ... were painted white and carved with festoons of flowers, birds and cupids. [...] The bed was the most extravagant piece.  Its graceful cane halftester rose high towards the cornice and was so festooned in carved white wood that the effect was <WSD>positively</WSD> insecure, as if the great couch were trimmed with icing sugar. 
Meaning of the word marked with <WSD> tags:  Very.