Definition of absentminded
1a : lost in thought and unaware of one's surroundings or actions : preoccupied was too absentminded to notice what time it was
b : tending to forget or fail to notice things : given to absence of mind (see absence sense 3) Her absentminded husband forgot their anniversary.
2 : indicative of or resulting from preoccupation or absence of mind gave an absentminded reply
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