Glacial (adjective)

1. Relating to or resembling glaciers, especially in being slow, steady and having a profound effect.
2. Extremely slow or gradual in progress or action.
3. Extremely cold and unfriendly in manner or appearance.

Origin:

Derived from the latin word 'glacies' meaning 'frost' or 'ice'.

Examples:

1. The glacial pace of change in the company is frustrating to many employees.
2. The glacial waters of the Arctic Ocean are inhospitable to most forms of marine life.
3. The glacial terrain is difficult to traverse, even with modern equipment.
4. Her glacial gaze made everyone in the room feel uneasy.
5. After the last Ice Age, the glacial activity has greatly reduced and the polar ice caps are melting.