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Synonyms for Outlandish (same or very similar meaning)

WordNet sense 1 (conspicuously or grossly unconventional or unusual):
bizarre, eccentric, flaky, freakish, freaky, off-the-wall, outre, flakey, gonzo

WordNet sense 2 (not conventional or conformist):
unconventional


From the ODE community, based on WordNetadd/edit