Mark the following part of speech: noun or adjective.

1. It’s all been an utter waste of time. ( )
2. They followed him without uttering a single word of protest. ( )
3. She uttered a lie. ( )
4. He gazed at me in utter confusion. ( )
5. Her ideas are simply utter. ( )
6. The words were uttered in my hearing. ( )
7. The engine uttered a shriek. ( ),