Final answer:
Impression materials that dislike moisture are hydrophobic, meaning they repel water and do not mix with it easily.
Step-by-step explanation:
Impression materials that dislike moisture and tend not to interact favorably with water are described as hydrophobic. The term hydrophobic literally means 'water fearing' and refers to materials that repel water rather than absorbing it or being wetted by it. This is in contrast to hydrophilic materials, which are 'water-loving' and tend to mix with, dissolve, or be wetted by water.