Out of my vocabulary Crossword

Showing luminous colors that seem to change when seen from different angles
Wave or swing wildly
Make a dull thudding sound
Tremble convulsively
Smaller than or occurring within an atom
For a very short time
Make a loud harsh quelling sound
Extremely impressive
Walk in a ostentatious yet casual manner
Say something suddenly and without careful consideration
The study of insects
A sudden, violent movement of the body usually caused by brain disorders
Walk or move at a slow relaxed pace
Say something abruptly
Be absorbed in thought
Of the cerebrum of the brain
Utter high pitched piercing sound
Make a continuous murming sound
A musical composition
Twist and turn with quick movements