Meaning of “sad” - Learner’s Dictionary

sad

adjective us uk /sæd/ sadder, saddest
Extra Examples
He had a sad expression on his face.It is sad that he must end his career under a cloud.Mary said a sad farewell to her friend.Lisa was feeling very sad about her exam results.I had the sad task of sorting through her papers after she died.
NOT HAPPY

A1 unhappy or making you feel unhappy:

I was very sad when our cat died.
a sad book/movie
[ + that ] It's a bit sad that you'll miss our wedding.
[ + to do sth ] I was sad to see him go.
NOT SATISFACTORY [ always before noun ]

not pleasant or satisfactory:

The sad truth is that we've failed.
NOT FASHIONABLE UK informal

boring or not fashionable:

You enjoy reading timetables? You sad man!
sadness noun [ U ]

B2

We could see the sadness in their faces.

(Definition of “sad” from the Cambridge Learner’s Dictionary © Cambridge University Press)