Sentence:  Alla Sizova , who seems to have made a special hit in the East , <WSD>was</WSD> delightful as the lady Bluebird and her partner , Yuri Soloviev , was wonderfully virile , acrobatic , and poetic all at the same time , in a tradition not unlike that of Nijinsky . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)