Sentence:  With the Gunners far too <WSD>lightweight</WSD> in midfield, Mikel Arteta dropped back into a deeper-lying role. This freed Yossi Benayoun to go further forward, a move that helped forge a rare Arsenal chance on 30 minutes when the Israeli released Van Persie, only for the Dutchman's snap-shot to be tipped around the post. 
Meaning of the word marked with <WSD> tags:  Lacking in strength