Sentence:  His manner was perhaps the more seductive, / Because he ne'er seem'd anxious to seduce; / Nothing affected, studied, or constructive / Of <WSD>coxcombry</WSD> or conquest: no abuse / Of his attractions marr'd the fair perspective, / To indicate a Cupidon broke loose, / And seem to say, "Resist us if you can" -- / Which makes a dandy while it spoils a man. 
Meaning of the word marked with <WSD> tags:  Behaviour or airs characteristic of a coxcomb; foppishness.