crisp

The adjective is derived partly from the following:

Etymology 1, adjective sense 1: Middle English crisp (“curly, wavy”), from Old English crisp (“curly”), from Latin crispus (“of hair: crimped, curly”), possibly ultimately from Proto-Indo-European *kris-, from *(s)ker- (“to bend; to turn”).

Etymology 1, adjective sense 2: from the above, and probably also onomatopoeic, representing a crinkling or crunching sound.

Doublet of crape and crepe.

Adjective etymology 1, adjective sense 2.2.3 (“of air, weather, etc.: cool and dry”) is transferred from a description of frost or snow as “crisp”, that is, crunchy.

The noun is derived partly from the following:

Middle English crisp (“light, crinkled fabric; kind of pastry; crinkliness or roughness of skin”), from crisp (adjective) (see above).

Modern English crisp (adjective) (“having a consistency which is hard yet brittle”).

Partly from the following:

Etymology 2 sense 1: crisp (adjective; see etymology 1).

Etymology 2 sense 2: Late Middle English crispen (“to curl; of hair: to be curly”), from Old English cirpsian (“to curl, crisp”), from Latin crīspō (“to crimp; to curl”), from crispus (“of hair: crimped, curly”, adjective) (see etymology 1) + -ō (suffix forming infinitives of first-conjugation verbs).