How to describe tone of voice (so a writer or AI can actually use it)
Ask a team to describe their tone of voice and you’ll almost always get the same three words: professional, friendly, approachable. It feels like an answer. It functions like nothing. Hand those three words to a new writer, a freelancer, or ChatGPT and every one of them produces something different, all of it defensible, none of it recognizably yours.
Describing tone of voice well is a specific skill. It means getting from adjectives to instructions. Here’s the method.
Why adjectives don't describe tone
An adjective is a label for a feeling, not a rule for producing one. “Friendly” is the result you want. It doesn’t say how to get there, so everyone fills the gap with their own idea of friendly. One writer adds exclamation points. Another drops contractions. A third opens with a joke. All friendly. None the same.
The deeper problem: adjectives describe the surface and skip the source. “Bold” is what the writing looks like. It doesn’t say what the brand believes strongly enough to sound bold about. Describe the surface alone and you get an imitation that collapses the moment the topic changes.
Start with dimensions, not adjectives
The most useful way to describe tone is as positions on a few scales, not a pile of words. The Nielsen Norman Group maps tone on four dimensions, and they make a good starting frame:
- Formal vs casual
- Serious vs funny
- Respectful vs irreverent
- Matter-of-fact vs enthusiastic
Place your brand on each one, and note that the position moves by context. You might sit casual and funny on social, formal and matter-of-fact on a security page. A dimension captures that range. An adjective freezes one point and pretends it’s the whole brand.
Then add the words, both lists
Dimensions set the register. Vocabulary makes it concrete. Write two lists: the words your brand reaches for, and the words it refuses. “Use,” not “utilize.” “Help,” not “empower.” Ban “seamless,” “robust,” and “in today’s fast-paced.”
The banned list does as much work as the reach-for list, because it tells a writer or a model exactly what off-brand looks like instead of leaving them to guess at it.
Show it, don't just say it
The single biggest upgrade to a tone description is a before-and-after. Take one ordinary sentence and write it twice. A fictional project tool’s password-reset email:
Flat: “Your password has been successfully reset. You may now log in with your new credentials.”
In tone: “Done. Your new password works now. Go log in.”
Same information. The second one shows the tone instead of describing it: short, plain, a little brisk. One before-and-after teaches more than ten adjectives, because it’s a rule someone can pattern-match against.
A tone description, worked end to end
Put the three steps together and here is what a finished description looks like, using a fictional payroll tool, Tilt, that believes payroll is terrifying and shouldn’t be.
Dimensions. Casual, not formal. Matter-of-fact, leaning reassuring. Serious about money, never about itself. On an error page it slides toward plain and calm; in a product announcement it warms up a few degrees.
Reach for: “paid,” “on time,” “sorted,” “you’re covered,” short verbs, real numbers. Refuse: “leverage,” “solutions,” “empower,” “seamless,” and any sentence that opens with “We’re excited to.”
Signature move. State the scary thing, then immediately take the fear away. “Tax filing is due Friday. We already did it.”
Before and after. Flat: “Your payroll run has been submitted for processing and will be completed within 2 business days.” In tone: “Payroll’s in. Everyone gets paid Thursday. Nothing else for you to do.”
That whole description fits on half a page, and every line of it is something a writer or a model can act on without guessing. Notice what it isn’t: a list of adjectives. It’s positions, words, a move, and a demonstration. For brands described at that level of specificity, our brand voice examples break several down the same way, and the tone of voice examples show the belief sitting under each surface tone.
Build yours like Tilt’s and you’ve crossed the gap adjectives never do: from describing how you want to sound to telling someone exactly how to sound that way.
The test: could a stranger replicate it
Here’s how to know your description works. Hand it to someone who has never written for the brand, or paste it into an AI tool, and ask for a paragraph. If what comes back sounds like you, the description is doing its job. If it comes back generic, the description was adjectives wearing a lanyard.
Specific enough to be replicated by a stranger is the whole bar.
Make the description machine-readable
There’s one more step most teams miss. The description has to reach the tools doing the writing. A tone section in a slide deck never makes it into the prompt box, and adjectives wouldn’t help the model if it did. Boomvoice turns your dimensions, vocabulary, and before-and-after examples into a machine-readable voice profile that plugs into your AI tools through MCP (Model Context Protocol), so the description actually shapes the output. Boomscore checks a draft against it and flags where the tone slipped.
Before it becomes a profile, it helps to capture all of this in a brand voice template: the dimensions, the word lists, and the before-and-after examples in one place.
Describe your tone so any tool can use it.
Boomvoice turns your tone description into a machine-readable voice profile your AI tools can read, dimensions, word lists, and examples included. Boomscore flags the drift.
Build your voice profile → boombrand.ai
