"Weakness of the flesh" is an archaic term that refers to the vulnerability of human beings to temptation and sinful behavior. There are several synonyms for this phrase, including "carnal weakness," "fleshly indulgence," and "physical frailty." These terms emphasize the idea that our physical bodies and desires can lead us astray from our moral and spiritual goals. Other synonyms for "weakness of the flesh" include "lustful inclination," "temptation of the senses," and "human frailty." While these phrases may sound old-fashioned or poetic, they are still relevant today when discussing the challenges we face in controlling our impulses and living virtuous lives.