Strong's Number 4190

poneros {pon-ay-ros'}

from a derivative of 4192

6:546,912

adjective

evil 51, wicked 10, wicked one 6, evil things 2, misc 7

Total: 76

1. full of labours, annoyances, hardships
   1. pressed and harassed by labours
   2. bringing toils, annoyances, perils; of a time full of peril to Christian faith and steadfastness; causing pain and trouble
2. bad, of a bad nature or condition
   1. in a physical sense: diseased or blind
   2. in an ethical sense: evil wicked, bad

The word is used in the nominative case in Mt. 6:13. This usually denotes a title in the Greek. Hence Christ is saying, deliver us from "The Evil", and is probably referring to Satan.