overcast [ˌəʊvəˈkɑ:st]

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adj.阴天的，阴暗的，愁闷的；v.遮盖，（使）变暗，包边缝；n.覆盖，阴天

cloudy and therefore not bright and sunny

The overcast and rainy weather found out his arthritis. 阴雨天使他的关节炎发作了。
The sky is overcast with dark clouds. 乌云满天。