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Adjective: off-the-wall  ,óf-dhu'wol
Usage: informal
  1. Conspicuously or grossly unconventional or unusual
    "his off-the-wall antics"; "He was famed for his off-the-wall choice of hats";
    - bizarre, eccentric, freakish, freaky [informal], flaky [informal], flakey [informal], gonzo [N. Amer, informal], outlandish, outré

See also: unconventional