Sentence:  Though all this Good be found in thee, I an offended that thou ſo <WSD>conniveſt</WSD> at the Hereſie of the falſe Teachers, as to permit ſome of them in your Communion, [...] 
Meaning of the word marked with <WSD> tags:  "Often followed by" '''(at)''': to pretend to be ignorant of something in order to escape blame; to ignore or overlook a fault deliberately.