opponent /ə-pōˈnənt/

1. The person opposed to one in a contest, struggle, battle, etc
2. Someone who opposes a course of action, belief, etc
3. An opponent muscle (anatomy)

1. Opposing
2. Antagonistic (with to; formerly with with)
3. Placed opposite or in front
4. (of a muscle) opposing one part (eg a digit) to another (anatomy)

oppoˈnency noun

• unflawed
• unfledged
• unflesh
• unfleshed
• unfleshes
• unfleshing
• unfleshly
• unflinching
• unflinchingly
• unfloored
• unflush
• unflushed
• unflushes
• unflushing
• unflustered
• unfocused
• unfocussed
• unfold
• unfolded
• unfolder
• unfolders
• unfolding
• unfoldings
• unfolds
• unfollow