Something that is erratic does not follow a regular pattern, but happens at unexpected times or moves along in an irregular way. Argentina's erratic inflation rate threatens to upset the plans. = unpredictable + erratically er·rati·cal·ly Police stopped him for driving erratically. something that is erratic does not follow any pattern or plan but happens in a way that is not regular (erratique, from errare; ERR)
A boulder or other rock fragment transported by glacial ice from their place of origin (or a previous glacial resting point) to an area which has a different type of bedrock
A boulder which has been transported from its source by a glacier, sometimes over a considerable distance, and has been left stranded when the ice melted; it is thus, often, of a different type from neighbouring rocks (3)
having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond"
A boulder that has been carried from its source by a glacier and deposited as the glacier melted Thus, the boulder is often of a different rock type from surrounding types
A large rock boulder that has been transported by glaciers away from its origin and deposited in a region of dissimilar rock
liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
A glacier borne boulder, often quite large, deposited far from its place of origin