English Thesaurus
(adjective) 
Definition
feeling sorrow
The loss left me feeling sad and empty.
Synonyms
unhappy
Her boss is horrible and she is desperately unhappy.
,
down
The old man sounded really down.
,
low
`I didn't ask for this job, you know,' he tells friends when he is low.
,
blue
There's no earthly reason for me to feel so blue.
,
depressed
He seemed somewhat depressed.
,
gloomy
He is gloomy about the fate of the economy.
,
grieved
,
dismal
You can't occupy yourself with dismal thoughts all the time.
,
melancholy
It was at this time of day that I felt most melancholy.
,
sombre
The pair were in sombre mood.
,
glum
What are you both looking so glum about?
,
wistful
There was a wistful look in his eyes when he spoke of his childhood.
,
mournful
He looked mournful, even near to tears.
,
dejected
Everyone has days when they feel dejected or down.
,
downcast
a glum, downcast expression
, , ,
lugubrious
He plays it so slowly that it becomes lugubrious.
,
pensive
She looked suddenly sombre and pensive.
,
disconsolate
He was looking increasingly disconsolate.
,
doleful
He stared over his glasses with a doleful look.
,
heavy-hearted
She looked as heavy-hearted as she felt.
,
down in the dumps (informal)
,
cheerless
They were like a restless, cheerless throng of lost souls.
,
lachrymose
the tears of lachrymose mourners
,
woebegone
She sniffed and looked quite woebegone.
,
down in the mouth (informal)
,
low-spirited
He was low-spirited, disappointed and out of humour.
,
triste (archaic)
,
sick at heart
Opposites
, , , , , , , , ,
chirpy (informal)
,
in good spirits
, ,
(adjective) 
Definition
causing, suggesting, or expressing sorrow
the sad news of the destruction of a historic building
Synonyms
tragic
She is a tragic figure.
, ,
upsetting
,
dark
His endless chatter kept me from thinking dark thoughts.
, ,
depressing
the depressing thought of his mother's death
,
disastrous
The team has had another disastrous day.
, , ,
poignant
a poignant reminder of her sister's death
, , ,
pitiful
It was the most pitiful sight I had ever seen.
,
calamitous
a calamitous air crash
,
heart-rending
heart-rending accounts of the disaster
,
pitiable
Her grandmother seemed to her a pitiable figure.
(adjective) 
Definition
deplorably bad
It's a sad truth that so few people care about the environment.
Synonyms
deplorable
Many of them work under deplorable conditions.
,
bad
It is bad that you repeated what I told you.
, ,
terrible
It was a terrible thing to do to someone.
, , ,
miserable
They have so far accepted only a miserable 1,100 refugees.
,
dismal
the country's dismal record in the Olympics
, ,
heartbreaking
one of the most heartbreaking letters I have ever received
, , ,
wretched
What a wretched excuse!
,
to be deplored
Opposites
(adjective) 
Definition
ridiculously pathetic
sad old bikers
Synonyms
ridiculous
It was an absolutely ridiculous decision.
,
silly
That's a silly thing to say.
,
pathetic
It was a pathetic sight, watching the people queue for food.
,
sorry
She is in a sorry state.
,
foolish-looking
(adjective) 
Definition
regrettable
a sad state of affairs
Synonyms
regrettable
a regrettable incident
,
disappointing
The response to the appeal was disappointing.
,
distressing
the distressing symptoms of anxiety
,
unhappy
I have already informed your unhappy father of your expulsion.
,
unfortunate
charity days to raise money for unfortunate people
, ,
woeful
a woeful ballad about lost love
, ,
lamentable
This lamentable state of affairs lasted until 1947.
Opposites

Additional synonyms

in the sense of bad
Definition
naughty or mischievous
It is bad that you repeated what I told you.
in the sense of blue
Definition
depressed or unhappy
There's no earthly reason for me to feel so blue.
Synonyms
low,
sad,
down in the dumps (informal),
down in the mouth,
down-hearted
in the sense of calamitous
Definition
resulting in or from disaster
a calamitous air crash

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Video: pronunciation of 'sad'

Source

Thesaurus for sad from the Collins English Thesaurus
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