i Register
In some senses, off-the-wall is marked as idiomatic. Watch for register when choosing this word.
VERB + OFF-THE-WALL
harebrained
OFF-THE-WALL + NOUN
character, idea
adj
Wildly unconventional; bizarre; absurd.
What kind of a harebrained, off-the-wall idea is that?
She is a very off-the-wall character.
Of a person's behaviour: greatly inappropriate.
All of their friends were amazed that they were familiar with a war hero. Some began to understand Chips' moods and drinking. His "off the wall" behaviour at times. And unknowingly they were "forgiving" him.
What kind of a harebrained, off-the-wall idea is that?
WiktionaryShe is a very off-the-wall character.
WiktionaryWhat makes it surprising, though, are the glimmers of wit and self-awareness beneath all the rap star swagger and over-the-top confrontations. Even the fervid finale had a few off-the-wall side jokes.
Wiktionaryi Register
In some senses, off-the-wall is marked as idiomatic. Watch for register when choosing this word.