Sentence:  The same can be said about the half-hearted Cuban invasion mounted by the administration last April , which , we trust , <WSD>is</WSD> not symptomatic of the methods to be invoked in holding off the felonious Khrushchev . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)