clueless

The definition of clueless is someone who doesn't know or understand something or is ignorant about a situation.

(adjective)

Someone who thinks their computer is broken when really it's just not plugged in is an example of clueless.

See clueless in Webster's New World College Dictionary

adjective

lacking clues or information
Informal
1. stupid; obtuse
2. ignorant or uninformed, specif. regarding a certain situation or matter: clueless about baseball

See clueless in American Heritage Dictionary 4

adjective

Lacking understanding or knowledge.

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