The answer is extremely curly. Milady describes this wave-pattern category in language that matches the question almost word for word: extremely curly hair often has low elasticity, breaks easily, and has a tendency to knot, especially on the ends.
The book recommends gentle scalp manipulations, conditioning shampoo, and a detangling rinse to help minimize the tangling this hair type is prone to. Wavy and curly hair sit on the same wave-pattern spectrum but are described with fewer of these fragility characteristics; extremely straight hair is the opposite end of the spectrum entirely.
Milady Standard Barbering, 6th ed., Ch. 10 (Properties and Disorders of the Hair and Scalp), p. 255: "Extremely curly hair often has low elasticity, breaks easily, and has a tendency to knot, especially on the ends."
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