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erratic (adj) irregular; having no fixed pattern.
Erratic power supply is irregular power supply and is unreliable. Erratic bus services are bus services which you cannot expect to on time.
- Rain fed crops in tropical countries is dependent on erratic monsoons, and very often monsoons fail exposing the countries to drought.
- To be on the safe side, let us have a power generator as a standby as the power supply here is erratic.