erratic

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Related to erratically: decisively, tumultuously

erratic

a piece of rock that differs in composition, shape, etc., from the rock surrounding it, having been transported from its place of origin, esp by glacial action

erratic

[ə′rad·ik]
(geology)
A rock fragment that has been transported a great distance, generally by glacier ice or floating ice, and differs from the bedrock on which it rests.
References in periodicals archive ?
In the second incident, we received a number of calls about another car being driven erratically in the Oldpark area at around 10.
The officer tried to approach Fisher, McLaughlin said, but he continued to behave erratically and was holding a "long blunt object" that appeared to be a staff.
Authorities are investigating why the campus officer fatally shot Collar who they say was acting erratically outside the campus police station early Saturday.
At approximately 04:15 BST on Monday, 18 June, officers stopped a vehicle after it was seen being driven erratically in Arthur Road, SW19.
saw a vehicle driving erratically, stopped the driver and noticed she seemed impaired by alcohol.
Prosecutor Justin Espie said on July 27 at 11pm police saw her car being driven erratically.
30am, officers on patrol in Eastgate Street saw a car being driven erratically.
WHY are moths always attracted to lightbulbs when they're switched on, and why do they flutter erratically around them?
These currents flow erratically, not in steady patterns making them dangerous even to the most experienced swimmers.
Speaking erratically in English and Spanish, Almendarez Coello denied any wrongdoing, saying the charges were brought against him by people who were ``envious'' of him.
In pursuit of an erratically held utopian ideal of universal equality, these tribunals routinely override certain Charter rights such as freedom of speech and religion.
If your forklift lifts erratically, it probably has a hydraulic leak.