I haven't seen a movie all week .
✗ I haven't seen a movie all weak .
I'm too weak to lift that suitcase.
✗ I'm too week to lift that suitcase.
A week is the standard unit of time equal to seven days.
I have an appointment this week.
The appointment is during the next few days.
"Weak" is the opposite of strong.
Look how skinny that person is. They must be very weak.
It would be difficult for that person to lift heavy objects.
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