English letters don't have meanings. They have sounds.
This is a three-letter prefix meaning "an error."
S - Strong-willed, A - Ambitious, M - Motivated, A - Adventurous, N - Nurturing, T - Thoughtful, H - Honest, A - Assertive.
The 4-letter root word meaning against or opposite is "anti."
The word you are looking for is 'neo'.
A 13-letter word that starts with "s" and ends with "s" is "schoolteachers."
S is for speed.
s
s
S for skull.
S (as in sense)
assault
s for seek
S = speed; T = tempo
s for sublimate
Essex
S is for speed.
e for evaporate s for sublimate