I found some
positive words that start with s even in Spanish! Here's the list:
Saludable - healthy
Sabroso - delicious
Sereno - serene
Satisfactorio - satisfactory
Sincero - sincere
Seguro - secure
Sabiduría - wisdom
Sorprendente - surprising
Sonriente - smiling
Suave - soft/smooth
Sólido - solid
Soñador - dreamy
Sagrado - sacred
Simpático - friendly/nice
Sensacional - sensational/amazing