con

an argument opposed to a proposal

a person serving a sentence in a jail or prison

a swindle in which you cheat at gambling or persuade a person to buy worthless property

deprive of by deceit; "He swindled me out of my inheritance"; "She defrauded the customers who trusted her"; "the cashier gypped me when he gave me too little change"

commit to memory; learn by heart; "Have you memorized your lines for the play yet?"

in opposition to a proposition, opinion, etc.; "much was written pro and con"