Sentence:  Westbrook further bemoans the Southern writers ' creation of an unreal image of their homeland , which is too readily assimilated by both foreign readers and visiting Yankees : `` Our northerner <WSD>is</WSD> suspicious of all this crass evidence [ of urbanization ] presented to his senses . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)