"Khum": the cute Vietnamese way to say no

Khum is a playful, cute way of writing không, the Vietnamese word for "no" or "not." You'll see it mostly in texts, comments and captions, where it softens a refusal and makes it sound teasing rather than blunt.

Say it like "khoom," with a breathy "kh" at the start, similar to clearing your throat very gently. It's informal, so it belongs in chats with friends, not in an email to your manager.

Where khum comes from

Standard không ("khohng") is one of the most common words in Vietnamese. It means "no," it turns verbs negative ("không biết," don't know) and it ends yes-or-no questions ("đi không?", going or not?).

Online, people started spelling it in ways that mimic a softer, more childlike pronunciation. Khum is one of those spellings, alongside hông, which reflects how many Southern speakers actually say không in casual speech, and shortcuts like ko and k. The exact moment khum took off isn't well documented, so treat any single origin story with caution. What's clear is that it spread through social media and is now widely recognized by younger Vietnamese speakers.

How khum is used

Khum works anywhere không would, but it changes the mood. Some typical examples:

• "Khum biết." "Dunno." A light, slightly shrugging "I don't know."
• "Khum chịu đâu." "Not gonna accept that," said in a pouty, joking way.
• "Khum sao đâu." "It's nothing, no worries."
• "Đi chơi khum?" "Wanna hang out?" The khum at the end turns it into a question.
• "Khum nha." "Nope," with the soft ending nha making it friendly.

That last one shows how khum pairs with sentence-ending particles. Adding nha or nhé makes almost anything gentler, which we explain in nha and nhé, the soft endings.

Khum vs. không vs. hông

All three mean the same thing, but they carry different tones of voice.

Không is neutral and correct in every situation. Use it when in doubt.

Hông sounds Southern and relaxed. It's a real spoken form, so you'll hear it out loud in Saigon and the Mekong Delta as well as read it in texts.

Khum is mostly a written, online style. It signals cuteness, playfulness or mock-sulking. Some people say it out loud as a joke, but it's far more common on screen.

If you're learning Vietnamese, it's worth knowing all three so you can read casual messages. In your own speech, stick with không until you know the people you're talking to and the tone they like.

When khum is a good idea

Khum is great when you want to turn down a small request without sounding cold. If a friend asks you to share your bubble tea and you're not going to, "khum" with a laughing emoji keeps it funny.

It's also handy for teasing. A reply of "khum thích" ("don't like it") to a friend's silly selfie reads as playful, not harsh.

When to avoid it

• Formal messages to teachers, bosses or clients
• Conversations with elders, who may find it childish
• Serious topics where a cute tone could seem dismissive

For polite refusals, Vietnamese has better tools. Our guide to saying no without sounding rude walks through softer options like "dạ, chắc không được ạ."

Other cute spellings you'll see

Khum belongs to a family of playful respellings. A few common ones:

• iu for yêu (love), as in "iu lắm" (love you lots)
• hum for hôm in phrases like "hum nay" (today), used by some writers
• dị for vậy (like that), reflecting Southern pronunciation, as in "sao dị?" (why's that?)
• hong without the tone mark, a quicker version of hông

Usage varies a lot between friend groups and regions, so don't be surprised if you see different spellings for the same word. We cover the speed-focused shortcuts in Vietnamese texting abbreviations.

Is khum Gen Z slang?

It's most associated with younger people online, and it fits alongside other Gen Z expressions. That said, plenty of people in their thirties and older use it with friends, especially in lighthearted group chats. It isn't offensive or rude, just very casual. You can find more of this vocabulary in our guide to Vietnamese Gen Z slang.

Next time you want to say no to a friend in Vietnamese without sounding serious, type "khum nha" and add a smiley.