Capricious

• Impossible to predict
• Not at all consistent
• Unpredictable boy catching rodent
• Irregular in movement
• Spotty

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Erratic \Er*rat"ic\, a. [L. erraticus, fr. errare to wander: cf. F. erratique. See Err .] Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars. The ...

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 ...

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