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Which one to use?Beginnernounadjective

weekvsweak

'Week' is the seven-day period; 'weak' means lacking strength or intensity.

Side-by-side comparison

week
noun

Noun. A period of seven days, usually from Monday to Sunday.

  • The project deadline is next week.

  • She works four days a week from home.

  • This week has been extremely stressful.

weak
adjective

Adjective. Lacking physical strength, power, conviction, or intensity.

  • After the flu, she felt too weak to walk.

  • The argument was weak and failed to convince the panel.

  • His weak handshake made a poor first impression.

Common mistake

Mixing them up in fast messages: "I've had a really weak" (meaning week) or "The signal is very week" (correct: weak).

Trick to remember it

'Week' has a double E — think of the two days of the weekend (Saturday and Sunday). 'Weak' has an A like 'ailing' — when you are weak you may feel unwell.

Quick rule

Are you talking about days or time? 'Week'. Are you talking about lack of strength or power? 'Weak'.

Did you know?

The English day names come from Norse and Roman deities: Monday (Moon), Tuesday (Tyr), Wednesday (Woden/Odin), Thursday (Thor), Friday (Frigg/Freya), Saturday (Saturn), Sunday (Sun).

Practise what you learned

Exercise 1 · Pick the right one

After three days without eating, he was too _____ to stand up.

Exercise 2 · Pick the right one

The conference takes place once a _____ every Tuesday morning.

Exercise 3 · Form the word

Week or weak? "The coffee was very _____ — it tasted like hot water." Write the correct word.

Hint: This describes the coffee lacking strength or intensity.

Frequently asked questions

When do I use "week" and when do I use "weak"?

Are you talking about days or time? 'Week'. Are you talking about lack of strength or power? 'Weak'.

What is the most common mistake with "week" and "weak"?

Mixing them up in fast messages: "I've had a really weak" (meaning week) or "The signal is very week" (correct: weak).

How do I remember the difference between "week" and "weak"?

'Week' has a double E — think of the two days of the weekend (Saturday and Sunday). 'Weak' has an A like 'ailing' — when you are weak you may feel unwell.

BL

Bryan López

Founder of SpeakUP Academy

July 29, 2026

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