FUN

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Across
  1. 3. of or according to the rules of logic or formal argument.
  2. 5. clearly visible or understood; obvious
  3. 6. treating serious issues with deliberately inappropriate humor; flippant.
  4. 7. worthy of attention or notice; remarkable.
  5. 10. inspiring fear or respect through being impressively large, powerful, intense, or capable.
Down
  1. 1. easily persuaded to believe something; credulous.
  2. 2. lacking restraint in spending money or using resources.
  3. 4. relaxed and unconcerned.
  4. 8. looking or sounding bizarre or unfamiliar.
  5. 9. achieving maximum productivity with minimum wasted effort or expense.