the.com/erratic
reliable only in its refusal to be predicted.
means behaving inconsistently or unpredictably, with no steady pattern to rely on.
from from latin errare, to wander or stray — the same root gives us error and errand, all rooted in aimless motion.
geology termerratic boulders were dragged far by glaciers
not randomrandomness has no memory, erratic often does
different fieldspsychiatry, weather, and stock charts all borrow it