Rigid and unrelenting.
Ghastly or sinister.
Disgusting; gross.
Dismal and gloomy, cold and forbidding.
To make grim; to give a stern or forbidding aspect to.
A disappointment or anticlimax.
The clearance of an aircraft to descend through clouds to clear air below, or the process of granting such a clearance.
The neurohormonal release of milk in dairy cows or in breastfeeding human mothers.