1. Liable to sudden unpredictable change
   "erratic behaviour"
   - fickle, mercurial, quicksilver 
2. Having no fixed course
   "an erratic comet"
   - planetary, wandering 
3. Likely to perform unpredictably
   "erratic winds are the bane of a sailor"
   - temperamental

1. (geology) a boulder of rock that differs from the surrounding bedrock because it has been transported by a glacier

Derived forms: erratics

See also: changeable, changeful, erratically, undependable, unreliable, unsettled

Encyclopedia: Erratic

• polyphony
• polyphosphate
• polyphosphoric acid
• polyphyletic
• Polyplacophora
• polyplacophore
• polyploid
• polyploidy
• Polypodiaceae
• Polypodiales
• Polypodium
• Polypodium aureum
• Polypodium glycyrrhiza
• Polypodium polypodioides
• Polypodium scouleri
• Polypodium virgianum
• Polypodium vulgare
• polypody
• polypoid
• Polyporaceae
• polypore
• Polyporus
• Polyporus frondosus
• Polyporus squamosus
• Polyporus tenuiculus