Extreme adjectives

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Across
  1. 5. The word comes from the Old French demander
  2. 6. Origin: excellere, from -cellere ‘to rise, stick up’
  3. 8. Franz Mesmer (1734-1815), Austrian doctor who developed hypnotism
  4. 9. English roots are awk, meaning "turned the wrong way"
  5. 12. means attractive, or irresistible, or really, really convincing
  6. 13. SYN terrible; extremely unpleasant
Down
  1. 1. enormous; en masse
  2. 2. comes from the Scottish gramarye meaning "magic, enchantment, spell;
  3. 3. really captures your interest: you can't take your eyes off it
  4. 4. SYN unbelievable, the Latin root credere means believe
  5. 7. all of your energy has been used up
  6. 10. OPP freezing
  7. 11. These days it's synonymous with "outstanding" and "totally cool."