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[flaming-tyger.livejournal.com]

erratic-adjective   [i-rat-ik]
1. deviating from the usual or proper course in conduct or opinion; eccentric; queer: erratic behavior.
2. having no certain or definite course; wandering; not fixed: erratic winds.

http://dictionary.reference.com/browse/erratic

His erratic behavior made many question how intelligent he actually was, despite his good grades and test scores.

Comments

[kryptyd.livejournal.com]

An erratic is also a boulder that has gotten left among rocks of a different kind by a glacier. That's a dumb way to explain it, but it's early.

I always found geography very amusing in school.