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Definition of Erratic
1. Adjective. Liable to sudden unpredictable change. "A quicksilver character, cool and willful at one moment, utterly fragile the next"
Similar to: Changeable, Changeful
Derivative terms: Fickleness
2. Adjective. Having no fixed course. "A planetary vagabond"
3. Adjective. Likely to perform unpredictably. "That beautiful but temperamental instrument the flute"
Definition of Erratic
1. a. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.
2. n. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
Definition of Erratic
1. Adjective. unsteady, random; prone to unexpected changes; not consistent ¹
2. Noun. (geology) A rock moved from one location to another, usually by a glacier. ¹
3. Noun. Anything that has erratic characteristics. ¹
¹ Source: wiktionary.com
Definition of Erratic
1. an eccentric person [n -S]
Medical Definition of Erratic
1.
1. Having no certain course; roving about without a fixed destination; wandering; moving; hence, applied to the planets as distinguished from the fixed stars. "The earth and each erratic world." (Blackmore)
2. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
3. Irregular; changeable. "Erratic fever." Erratic blocks, gravel, etc.