also: きてれつ
na-adjective
very strange; bizarre; outlandish
Colloquial and emphatic; describes something extremely odd or eccentric, often with a humorous or exaggerated tone.
彼のファッションはいつもキテレツだ。
His fashion is always outlandish.
キテレツなアイデアが次々と浮かんだ。
Bizarre ideas kept popping into my head one after another.
Hiragana spelling, also common.
The exact derivation is uncertain. The kanji 奇天烈 are ateji (phonetic equivalents) and do not reflect the word's origin. It may be a sound-symbolic coinage emphasizing oddness.