Lament vs Mourn

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

Lament

Formal Beyond 10,000 (less common)

Mourn

Top 3,000 (common) B1 verb

Most formal: Lament Most common: Mourn

	Lament	Mourn
Pronunciation	🇬🇧 //ləˈmɛnt// 🇺🇸 //ləˈmɛnt//	🇬🇧 //mɔːn// 🇺🇸 //mɔrn//
Meaning	to express sadness or regret	To feel sadness for someone who has died.
Example	She began to lament the loss of her childhood home.	Many people continue to mourn the loss of their loved ones.
Register	Formal	Neutral
How common	Beyond 10,000 (less common)	Top 3,000 (common)
CEFR level	-	B1
Part of speech		verb
Collocations	lament someone's death, lament the past, lament a mistake	mourn a death, mourn the loss, mourn deeply, mourn in silence
Antonyms	rejoice, celebrate, delight	celebrate, rejoice
Common mistakes	Confused with 'lamentation', which is the noun form., Used too casually among friends., Incorrectly spelled as 'lamant'.	Confused with 'mourning' (the process of grieving)., Incorrect verb form in sentences., Using 'mourn' with an inanimate object.
Usage notes	Best used in serious contexts like literature or speeches. Avoid in casual conversation.	Used in both formal and informal contexts. Appropriate when discussing grief or death. Avoid using in light-hearted conversations.

See it in real clips

The Lord Of The Rings › The Fellowship Of The Ring

A lament for Gandalf.

Lament

House Of Dragons › S1 E1

We must all mourn in our own way, your grace.

Mourn

Frequently asked questions: Lament vs Mourn

What's the difference between Lament and Mourn?

Lament: to express sadness or regret Mourn: To feel sadness for someone who has died.

Which is more formal: Lament and Mourn?

Lament is the most formal of these.

Which is more common: Lament and Mourn?

Mourn is the most common in everyday English.

Can you show an example of each?

Lament: She began to lament the loss of her childhood home. Mourn: Many people continue to mourn the loss of their loved ones.

Can I use Lament and Mourn interchangeably?

Not always. Lament and Mourn are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.