Concept and Meaning of SteepStiff is an adjective that, regarding hair, refers to those who fall straight and smooth without forming loops or waves. We can say that straight hair are therefore those that are smooth, unlike those that are wrinkled or notched.
Examples: "I love the way you wear straight hair", "a straight hairstyle lasts me only a few minutes because my hair are rebellious and always eventually form loops", "model has impressed the public with its long straight and blond hair."
There are various devices (readers) and products that help to keep or make straight hair. However, many of these options can make them dry or lose the natural shine of the hair. Some possibilities to promote straight hair are to use a shampoo and a conditioner specific to this effect to apply nourishing cream, use a comb to detangle hair (without breaking) and to have a healthy diet rich in antioxidants.
The notion of stiff, on the other hand, can be linked to something low, faded, worn or without strength, that lack of flexibility or is hard to ride (a slope, for example).
In the literary sense, this adjective refers to any person showing inflexible and refusing to cede. In the colloquial language, stiff refers to what is unusual, amazing or what strikes even offends decency or is rude in some way.
Popularly, say that someone is steep means that the person in question is drunk.