1.
Glacial means relating to or produced by glaciers or ice. (TECHNICAL)
...a true ~ landscape with U-shaped valleys.
ADJ: usu ADJ n
2.
If you say that a person, action, or atmosphere is ~, you mean that they are very unfriendly or hostile.
Inside the jeep the atmosphere was ~.
= frosty, icy
ADJ disapproval
3.
If you say that something moves or changes at a ~ pace, you are emphasizing that it moves or changes very slowly.
ADJ: usu ADJ n emphasis
4.
If you describe someone, usually a woman, as ~, you mean they are very beautiful and elegant, but do not show their feelings.
Her ~ beauty is magnetic.
ADJ: usu ADJ n