unkindest cut of all, (most)

the (most) unkindest cut (of all)

The most heartless, demoralizing, or treacherous action, remark, or outcome possible. A reference to a line in Shakespeare's Julius Caesar, describing Caesar's death at the hands of his friends. But the unkindest cut was watching the man I considered my best friend move in with my ex-wife the second I moved out. Even my teachers stood there laughing at me. That was the most unkindest cut of all. Seeing such a beloved character turned into such an absurd parody of herself, well, that's the unkindest cut of all for longtime fans of the series.
See also: cut, unkind
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

unkindest cut of all, (most)

The worst insult, the ultimate in treachery. This expression was used by Shakespeare to describe the assassination of Julius Caesar by his friends: “This was the most unkindest cut of all” (Julius Caesar, 3.2). It found its way into the proverb collections of James Howell, John Ray, and Thomas Fuller, which helped its long survival, although today most, which made it a double superlative, is usually omitted.
See also: cut, of, unkind
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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