A schlemiel is somebody who often spills his soup, and a schlimazel is the person it lands on.

Schlemiel - Wikipedia

“A schlemiel, a schlimazel and a schmendrik are irredeemably what they are. A schmuck can be enlightened. He can acquire, through a painful process of self-examination, the moral and social understanding that he has been missing. He can become, to revert to Wex’s dichotomy, a mentsh.”

Etiquette for Schmucks, Schlemiels, Schlimazels and Schmendriks

Last week’s column, a reply to a reader’s query about the Yiddish word mentsh, invoked Michael Wex’s 2009 book, “How To Be a Mentsh (& not a Shmuck).