1. Vacuously or complacently and unconsciously foolish
   - fatuously

See also: inane

• ether
• ethereal
• ethereality
• etherealize
• ethereally
• etherialise
• etherialize
• etheric
• etherification
• etherify
• etherise
• etherize
• ethernet
• ethernet cable
• ethic
• ethical
• ethical code
• ethical drug
• ethical motive
• ethically
• ethician
• ethicism
• ethicist
• ethics
• ethics committee