adjective

(of an action) convenient and practical although possibly improper or immoral.

either side could break the agreement if it were expedient to do so

convenient,advantageous,in one’s own interests,to one’s own advantage,useful,of use,of service,beneficial,of benefit,profitable,gainful,effective,helpful,practical,pragmatic,strategic,tactical,politic,prudent,wise,judicious,sensible,desirable,suitable,advisable,appropriate,apt,fit,timely,opportune,propitious

noun

a means of attaining an end, especially one that is convenient but possibly improper or immoral.

the current policy is a political expedient

measure,means,method,stratagem,scheme,plan,course of action,solution,move,tactic,manoeuvre,recourse,resource,device,tool,contrivance,ploy,plot,machination,trick,ruse,artifice,invention,stopgap,dodge,lurk,shift,fetch