In Japanese the word hentai anime is a kanji compound of (hen meaning "change" "weird" or "strange") and (tai meaning "attitude" or "appearance"). The term is used as a shortened form of the phrase (hentai seiyoku), or "sexual perversion". In slang, hentai is used as an insult meaning roughly "pervert" or "weirdo". The term is not often applied to pornography in Japan. Instead, terms such as 18-kin, literally meaning "prohibited to those not yet 18 years old", and seijin manga "adult manga" are used when referring to free hentai pictures in pornography.