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Across 5. domain, duchy, bailiwick, jurisdiction 6. enlarge, expand, prolong 9. combative, belligerent 10. promise, sureness, poise 11. renew 14. found, bring about, academy 16. zealous, raving, infuriated, berserk 18. sanatorium, sancutary 19. gamble, try, chance 20. frivolous, impudent, impertinent, insolent

Down 1. nonsensical, absurd, incredible 2. trash, detritus 3. solace, alleviate 4. bend, distort, mishape 7. exemption 8. satisfy, profit, benefit 12. difficulty, impediment 13. first-rate, outstanding, worthy 15. decrease, shrink, fade, peter out 17. thin, scanty, few and far between