UNPREDICTABLE
ADJECTIVES
– unpredictable, hot-headed, wild AGGRO 1990s sl., orig. US college usage
NOUNS, PERSON
– a dangerously unpredictable person WILD CARD 2001 UK sl.
– an unpredictable or inconsistent person whose moods and actions go up and down YOYO 1959 US sl.
– an unpredictable, unreliable person; a mentally unstable person; a person who is obsessed by a single topic or hobby CRANK 1833 US sl.
Lexicophilia 