There are many words that can be used to describe a "sharp freeze", including frost, freezing, frigid, icy, glacial, bitter cold, arctic blast, bone-chilling cold, biting cold, and more. Each of these synonyms provides a slightly different shade of meaning, with "frost" suggesting a light coating of ice, "frigid" indicating extreme coldness, and "glacial" conjuring images of slow-moving ice masses. "Arctic blast" and "bone-chilling cold" both evoke powerful sensations of discomfort and pain, while "biting cold" suggests a sharp, physical sensation. Overall, these synonyms offer a range of options for describing a "sharp freeze", depending on the specific context and intensity of the cold weather.