erratic

About 2.20 uses per million words.

Meaning

1. adjective Unsteady, random; prone to unexpected changes; not consistent.

   Henry has been getting erratic scores on his tests: 40% last week, but 98% this week.

2. adjective Deviating from normal opinions or actions; eccentric; odd.

   erratic conduct

3. noun A rock moved from one location to another, usually by a glacier.
4. noun Anything that has erratic characteristics.

Similar words

fickle unsettled temperamental undependable unreliable changeful wandering changeable quicksilver planetary

Often followed by

and behavior in course blocks or behaviour movements boulders

Word family

erratical erratically erraticism erraticisms erratics