Unsteady, random; prone to unexpected changes; not consistent. / Deviating from normal opinions or actions; eccentric; odd.

(geology) A rock moved from one location to another, usually by a glacier. / Anything that has erratic characteristics.

(rare) erratic

In an erratic manner; unsteadily or randomly, unpredictably.

plural of erratic

The quality of being erratic.

plural of erraticity

erraticness

plural of erration

(obsolete, rare) Wandering or straying.