Sentence:  His arm had been giving him some trouble and Rector <WSD>was</WSD> not enough of a medical expert to determine whether it had healed improperly or whether Hino was simply rebelling against the tedious work in the print shop , using the stiffness in his arm as an excuse . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)