“weak” vs. “week”

Use "weak" for the adjective meaning lacking strength, power, or effectiveness; use "week" for the noun naming a seven-day period of time.

The real distinction

"Weak" describes a lack of strength or effectiveness, while "week" names a seven-day period of time, and despite identical pronunciation the two words never overlap in meaning, since one is an adjective describing quality and the other a noun measuring time. A reliable check: if the word describes strength, power, resolve, or effectiveness (or the lack thereof), it's "weak" ("his weak excuse convinced no one"); if the word describes a unit of time spanning seven days, it's "week" ("she'll be back in a week"). Because these words are truly perfect homophones in virtually every English dialect, this pair is a classic early spelling challenge for children and English learners, appearing constantly in elementary spelling curricula specifically because the sound offers no clue at all to the correct spelling — only grammatical context (adjective describing a quality versus noun measuring time) can reliably distinguish them. It's also worth noting that "weak" pairs naturally with words describing deficiency — "weak signal," "weak economy," "weak coffee" — while "week" pairs naturally with calendar and scheduling vocabulary — "next week," "a busy week," "week by week" — two entirely separate semantic clusters that rarely overlap in a single sentence.

Examples with “weak”

• His grip felt weak after the long surgery recovery.
• The committee found the argument weak and unconvincing.
• She felt weak and dizzy after skipping breakfast.
• The team's weak defense cost them the game.
• His weak excuse didn't fool anyone in the room.
• The signal was too weak to stream the video.
• Years of illness left him physically weak.
• The coffee tasted weak compared to her usual brew.
• Their weak leadership led to years of poor decisions.
• The bridge's weak supports needed immediate reinforcement.
• The weak cell signal made the video call nearly impossible.
• Her weak ankle kept her off the trail for months.
• The weak handshake surprised everyone who met him.
• Investors worried about the currency's persistently weak performance.
• A weak Wi-Fi signal disrupted the entire video conference.

Examples with “week”

• She'll be traveling for work next week.
• They finished the entire project in just one week.
• The class meets twice a week throughout the semester.
• He took a week off to recover from the flu.
• The forecast predicts rain for most of the week.
• She's been training for the marathon for six weeks.
• Their vacation lasted exactly two weeks.
• The report is due by the end of the week.
• He starts his new job the first week of March.
• The festival runs for a full week every summer.
• The entire project came together over just one busy week.
• He spent the entire week preparing for the certification exam.
• They celebrated their anniversary during the same week every year.
• The forecast calls for sunshine through most of next week.

Memory trick

Picture something "weak" bending or giving way, echoing its root meaning "to yield." "Week" simply measures seven days on the calendar, with no connection to strength at all — if the sentence involves Monday through Sunday, you need "week," not "weak." As a final check, ask whether the sentence describes strength or its absence (use "weak") or a span of seven days (use "week") — the two rarely appear in overlapping sentence types.