1. (of petrol) not containing tetraethyl lead
   - lead-free

See also: leadless, unleaded

• unmoderated
• unmodernised
• unmodernized
• unmodifiable
• unmodified
• unmodulated
• unmolested
• unmoor
• unmoral
• unmortgaged
• unmotivated
• unmotorised
• unmotorized
• unmourned
• unmovable
• unmoved
• unmoving
• unmown
• unmuffle
• unmusical
• unmusically
• unmutilated
• unmuzzle
• unmyelinated
• unnameable