off-the-wall ( synonym found)
Definition of off-the-wall:

°(idiom) Wildly unconventional; bizarre; absurd.
"What kind of a harebrained, off-the-wall idea is that?"
°(idiom) Greatly inappropriate.
"His behaviour today is off-the-wall."
Definition of off-the-wall:

°(idiom) Wildly unconventional; bizarre; absurd.
"What kind of a harebrained, off-the-wall idea is that?"
°(idiom) Greatly inappropriate.
"His behaviour today is off-the-wall."
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