1. (of especially persons) lacking sense or understanding or judgment
   - nitwitted, senseless, witless

See also: stupid

• filter
• filter bed
• filter coffee
• filter out
• filter paper
• filter tip
• filter-tipped
• filter-tipped cigarette
• filth
• filthily
• filthiness
• filthy
• filthy lucre
• filtrate
• filtration
• filtration surgery
• filum
• fimbria
• fimbriate
• fimbriated
• fin
• fin de siècle
• fin keel
• fin whale
• finable