Sentence:  Holmes is addicted to the use of cocaine and other refreshing stimulants ; he <WSD>is</WSD> prone to semi catatonic trances induced by the playing of the vioiln ; he is a recluse , an incredible egotist , a confirmed misogynist . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)