Объясните эти слова на : nervous - appeared - astonished - stepped back - apart from- instant - staring -

1) Nervous - easily alarmed, tending to be anxious 
2) Appeared - seemed, became noticable, visible 
3) Astonished - greatly surprised or impressed, amazed
4) Stepped back - to give, retreat 
5) Apart from - moreover, besides, in addition 
6) Instant - happening immediately, urgent, pressing 
7) Staring - look fixedly at someone