Synonym: abnormal, changeable, irregular, queer, uncertain, unstable, unusual. Similar words: aberration, narrative, democratic, autocratic, idiosyncratic, errant, terrain, aberrant. Meaning: [ɪ'rætɪk] 
adj. 1. having no fixed course 2. liable to sudden unpredictable change 3. likely to perform unpredictably.
adj. 1. having no fixed course 2. liable to sudden unpredictable change 3. likely to perform unpredictably. 
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121. Symptoms include erratic behaviour of the Media Player and problems with the file system.
122. He is a good fellow, but then he is so erratic.
123. The prosody is erratic.
124. How could I leave my loving, erratic, harebrained mother to fend for herself?
125. While the Teamgeist ball was great for strikers, many goal keepers complained that the ball's aerodynamics created a lack of rotation in the air, making its path at times erratic, like a knuckleball.
126. The soldiers were plagued with amplifiers that misbehaved, and blamed the manufacturers for their erratic behaviour.
127. Libya is a specific case: Muammar el-Qaddafi is erratic, widely reviled, armed with mustard gas and has a history of supporting terrorism.
128. He was beginning to be able to interpret the erratic gestures of her left arm.
More similar words: aberration, narrative, democratic, autocratic, idiosyncratic, errant, terrain, aberrant, terra firma, or rather, ratification, gratification, narrator, extraterrestrial, ratio, static, rating, ratify, dogmatic, dramatic, for a time, gratify, statically, pragmatic, fanatical, automatic, operation, ratified, operating, statistics.