Like all of language: context.

Why would hair be like 80s synthpop, or potatoes be in any way related to a by-product of honey?

Hair can be either waxy or wavy or both.

Her long blond waxy hair blew in the wind.

Context.

Her wa[]y hair was a challenge for the hairdresser

I'm not saying the context always disambiguates it. You can have ambiguous sentences even with perfect fonts.

The judge delivered an ambiguous sentence.

> Her long blond waxy hair blew in the wind.

Same question as GP - how can you tell if that was meant to be waxy or wavy?

From the context. Long hair blowing in the wind is a description of beautiful hair. Wavy hair is beautiful; waxy hair is not.

This is very obvious to most people.

"I'll have you know that some people find waxy hair beautifully therefore your example is invalid and I am very intelligent"

:nerd: