overcast
adjective /ˌəʊvəˈkɑːst/
  /ˌəʊvərˈkæst/
 - covered with clouds; not bright- an overcast sky/day
- Today it will be dull and overcast.
- The sky was overcast and we needed to use artificial light.
 Oxford Collocations Dictionaryverbs- be
- look
- become
- …
 - completely
- heavily
- very
- …