Constant vs Lifelong

When to use each in English, with meaning, register, and examples.

 ConstantLifelong
MeaningSomething that stays the same and doesn't change.lasting for the whole life
CEFR levelB2C1
Part of speechadjectiveadjective
Usage notesUse 'constant' when discussing something that remains unchanged over time. It can be used in both formal and informal contexts, but is often used in academic or scientific discussions.Use 'lifelong' to describe commitments or experiences that last a person's entire life. It's appropriate in both formal and informal contexts, but avoid it in casual conversations where simpler terms might suffice.

Frequently asked questions: Constant vs Lifelong

What's the difference between "Constant" and "Lifelong"?

"Constant" means: Something that stays the same and doesn't change. "Lifelong" means: lasting for the whole life

When should I use "Constant" and "Lifelong"?

They can all be used in everyday English.

Are "Constant" and "Lifelong" the same CEFR level?

"Constant" is at B2, "Lifelong" is at C1 on the CEFR scale.

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