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5. the rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light)
7. make certain that (something) will occur or be the case
8. an unborn or unhatched offspring in the process of development, in particular a human offspring during the period from approximately the second to the eighth week after fertilization (after which it is usually termed a fetus)
13. the ability not to be affected by something, especially adversely
14. drive or force (an attack or attacker) back or away
15. seeking to exploit others

1. (of a message, sound, or transmission) confused and distorted; unclear
2. a state or period of uncontrolled excitement or wild behaviour
3. dark and gloomy, especially due to thick mist
4. the action of resisting attack
6. belonging to the present time; happening or being used or done now
9. go or move back or further away from a previous position
10. discover or identify the presence or existence of
11. interrupt (an event, activity, or process) by causing a disturbance or problem
12. squeeze or pack tightly into a specified space