1. An alloy of nickel and copper and other metals (such as iron and/or manganese and/or aluminium)
   - Monell metal

Type of: nickel alloy, nickel-base alloy

• unflappable
• unflattering
• unflavored
• unflavoured
• unflawed
• unfledged
• unflinching
• unflinchingly
• unfluctuating
• unflurried
• unflustered
• unfocused
• unfocussed
• unfold
• unfolding
• unforbearing
• unforced
• unforceful
• unforeseeable
• unforeseen
• unforesightful
• unforested
• unforethoughtful
• unforfeitable
• unforgettable