erratic
Translation
erratic, unpredictable, irregular
Examples
His behavior has been very erratic lately.
His behaviour has been very erratic lately.
The car followed an erratic course down the road.
The car followed an erratic course down the road.
Grammar Patterns
((erratic)) ((noun)) not regular, certain, or organized in movement or behavior His erratic behavior worried us.
Similar Words
Synonyms: unpredictable, inconsistent, irregular; Antonyms: consistent, predictable.
Etymology
From Latin *errare* 'to wander, stray'. It describes something that wanders from a predictable path.
Memory Tips
An 'error' in a system can cause 'erratic' behavior. Think of a robot moving unpredictably.