Far from consistent

• Irregular in movement
• Lacking consistency
• Hit or miss
• Irregular; queer
• Capricious
• All over the place

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
adjective COLLOCATIONS FROM CORPUS ■ ADVERB more ▪ But as the subject's brain function becomes increasingly impaired these movements become more and more erratic . ▪ The history of the Federal Republic might then have followed a more erratic course. ▪ This ...

Wiktionary Word definitions in Wiktionary
a. 1 unsteady, random; prone to unexpected changes; not consistent 2 Deviating from the common course in opinion or conduct; eccentric; odd. n. 1 (context geology English) A rock moved from one location to another, usually by a glacier. 2 Anything that ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Erratic \Er*rat"ic\, n. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character. A rogue. [Obs.] --Cockeram. (Geol.) Any stone or material that has been borne away from its original site by natural ...

Wikipedia Word definitions in Wikipedia
Erratic may refer to: Erratic, a project of music artist Jan Robbe Glacial erratic , a piece of rock that differs from the size and type of rock native to the area in which it rests Erratic ant ( Tapinoma erraticum ), a species of ant