noun
a large, dense, and towering cloud associated with thunderstorms and lightning
-
The dark thunderclouds gathered on the horizon, signaling an approaching storm.
-
Wow, those thunderclouds look really ominous. Looks like we're in for some rain.
-
Man, those thunderclouds are looking pretty angry. Better grab an umbrella.
-
Her mood was like a thundercloud, dark and brooding, ready to burst at any moment.