na-adjective, noun which may take the genitive case particle 'no', noun
fantastic; bizarre; incredible; unbelievable
Describes ideas, stories, or events that are so original or strange they seem beyond ordinary imagination. Often used in a positive or neutral sense for creativity, but can also imply absurdity.
I'm always amazed by his fantastic ideas.
その映画は奇想天外なストーリーで観客を魅了した。
The movie captivated the audience with its incredible story.
noun
tree tumbo; Welwitschia mirabilis
Rare botanical use; refers to the desert plant Welwitschia mirabilis, also known as tree tumbo. This sense is a specialized noun usage.
See also: ウェルウィッチア
奇想天外はアフリカの砂漠に生息する珍しい植物だ。
The tree tumbo is a rare plant that lives in the deserts of Africa.