not under any circumstance(s)

not under any circumstance(s)

At no time; never; for no reason whatsoever. No child of mine is going to become a lawyer—not under any circumstances! A: "Would you ever consider joining one of our committees in the future?" B: "No, not under any circumstance." Fans are not allowed backstage under any circumstances!
See also: any, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

under any circumstances

Also, under no circumstances. See under the circumstances.
See also: any, circumstance
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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