space cadet

English Thesaurus

1. someone who seems unable to respond appropriately to reality (as if under the influence of some narcotic drug) (noun.person)

hypernym	:	simple, simpleton,
definition	:	a person lacking intelligence or common sense (noun.person)

domain category	:	narcotic,
definition	:	a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction (noun.artifact)