Across
- 7. introspective, introvert
- 8. posthumous, postscript, posterity, posterior
- 9. superb, superior, superfluous, supernatural
- 10. semiannual, semiformal
- 11. mistake, misfortune, misfire, misguided
- 13. unequal, undone, unequivocal, unconventional
Down
- 1. malcontent, malicious
- 2. triangle, triceps, triad, triceratops
- 3. symbol, symmetry, symphony, symposium
- 4. preposition, premonition, predict, predecessor
- 5. nonprofit, nonconformity, nonchalant
- 6. subtract, subordinate, submarine, substantial
- 12. synchronize, syndrome, synonym, synopsis