1. Outside a building
   - outside, outdoors, alfresco

1. Where the air is unconfined
   - outdoors, open air, open

Type of: exterior, outside

• unflagging
• unflaggingly
• unflappability
• unflappable
• unflattering
• unflavored
• unflavoured
• unflawed
• unfledged
• unflinching
• unflinchingly
• unfluctuating
• unflurried
• unflustered
• unfocused
• unfocussed
• unfold
• unfolding
• unforbearing
• unforced
• unforceful
• unforeseeable
• unforeseen
• unforesightful
• unforested