XB2U2

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Across
  1. 4. : so strong that it is difficult to handle (adj.)
  2. 6. : the act of taking part in an activity (n.)
  3. 7. : the act of coming into contact with something new (n.)
  4. 8. : to quote or mention as an example (v.)
  5. 9. : to say that something is not true (v.)
Down
  1. 1. : a change made to fit a new environment or situation (n.)
  2. 2. : a skill or certificate gained by training or exam (n.)
  3. 3. : a particular way of thinking about something (n.)
  4. 5. : to make someone want to do something (v.)