YOU SAID:

expect the worst an you shall never be dissapointed

INTO JAPANESE

最悪の事態を予期し、失望することはありません

BACK INTO ENGLISH

Expect the worst and don't be disappointed

INTO JAPANESE

最悪の事態を想定し、がっかりしない

BACK INTO ENGLISH

Expect the worst and don't get discouraged

INTO JAPANESE

最悪の事態を想定し、落胆しない

BACK INTO ENGLISH

Expect the worst and don't get discouraged