1) full of labours, annoyances, hardships
    1a) pressed and harassed by labours
    1b) 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
    2a) in a physical sense: diseased or blind
    2b) in an ethical sense: evil wicked, bad

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 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.