One who is given to flight or fleeing; a person who frequently flees or evades; a flighty or unreliable person.
Compound of flight plus head (where head can mean a person or leader), creating a noun for someone characterized by flights of fancy, evasion, or unreliability, similar to other -head compounds like blockhead or hotheaded.
Flighthead is a perfectly logical English compound that describes someone mentally in constant flight—possibly from responsibility, commitment, or serious thought—making it a word that should exist more prominently to describe distracted modernity.
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