English Thesaurus
(adjective) 
Definition
much narrower than it is long
A thin cable carries the signal to a computer.
Synonyms
narrow
She arranged the flowers in a vase with a narrow neck.
,
fine
The heat scorched the fine hairs on her arms.
, , ,
threadlike
Opposites
(adjective) 
Definition
(of a person or animal) having no excess body fat
a tall, thin man with grey hair
Synonyms
slim
She is pretty, of slim build, with blue eyes.
,
spare
She was thin and spare, with a shapely intelligent face.
,
lean
She watched the tall, lean figure step into the car.
, ,
slender
The crane raised its slender neck.
,
skinny
He was quite a skinny little boy.
,
light
Try to wear light, loose clothes.
, , ,
bony
an old man with a bony face and white hair
,
lanky
He was six feet four, all lanky and leggy.
,
emaciated
horrific television pictures of emaciated prisoners
, ,
underweight
Nearly a third of the children were severely underweight.
,
scrawny
a scrawny woman with dyed black hair
,
lank
a lank youth with a ponytail
, ,
skin and bone
,
scraggy
a flock of scraggy sheep
,
thin as a rake
,
macilent (rare)
Opposites
(adjective) 
The recipe makes about 5 dozen thin biscuits.
Synonyms
wafer-thin
,
paper-thin
,
papery
the papery skin of garlic cloves
(adjective) 
Definition
not dense
The soup was thin and clear.
Synonyms
watery
a plateful of watery cabbage soup
,
weak
a weak cup of tea
,
diluted
Encourage your child to drink diluted fruit juice.
,
dilute
a dilute solution of bleach
,
runny
Warm the honey until it becomes runny.
, ,
wishy-washy (informal)
Opposites
(adjective) 
The crowd had been thin for the first half of the match.
Synonyms
meagre
a meagre 3% pay rise
,
sparse
Many slopes are rock fields with sparse vegetation.
,
scanty
So far, what scanty evidence we have points to two subjects.
,
poor
poor wages and terrible working conditions
A poor crop has sent vegetable prices spiralling.
,
scattered
,
inadequate
Supplies of food and medicine are inadequate.
,
insufficient
There was insufficient evidence to proceed.
,
deficient
a diet deficient in vitamins
,
Opposites
(adjective) 
Definition
not dense
Her gown was thin and she shivered from the cold.
Synonyms
fine
Her suit was of a pale grey fine material.
,
delicate
The colours are delicate and tasteful.
,
flimsy
a flimsy pink chiffon nightgown
,
sheer
sheer black tights
,
transparent
a sheet of transparent coloured plastic
,
see-through
She was wearing a white see-through blouse.
, ,
skimpy
skimpy underwear
,
gossamer
daring gossamer dresses of sheer black lace
, ,
filmy
a long, filmy skirt
,
Opposites
(adjective) 
Definition
unconvincing because badly thought out or badly presented
The evidence is thin, and to some extent, ambiguous.
Synonyms
unconvincing
He was given the usual unconvincing excuses.
, , ,
poor
The meal was very poor.
He was a poor actor.
,
weak
The evidence against him was too weak to hold up in court.
,
slight
It's only made a slight difference.
,
shallow
I think he is shallow, vain and untrustworthy.
, , ,
lame
He mumbled some lame excuse about having gone to sleep.
,
scant
The hole was a scant 0.23 inches in diameter.
,
flimsy
a flimsy wooden door
, ,
Opposites
(adjective) 
Definition
(of a voice) high-pitched and not very loud
Her thin voice rose high in complaint.
Synonyms
weak
Her voice was so weak we could hardly hear her.
,
faint
He became aware of the soft, faint sounds of water dripping.
,
feeble
This is a feeble argument.
,
small
a very small voice
,
low
She's still feeling a bit low after having flu.
,
soft
He says the measure is soft and weak on criminals.
, ,
reedy
(adjective) 
Definition
made up of only a few, widely separated, people or things
She had pale thin yellow hair.
Synonyms
wispy
a wispy chiffon dress
,
thinning
, , ,
scanty
a model in scanty clothing
(verb) 
Definition
to make or become thin or sparse
It would have been better to thin the trees over several winters.
Synonyms
prune
You have to prune the bushes if you want fruit.
,
trim
They looked at ways they could trim these costs.
,
cut back
,
weed out
(verb) 
Definition
to make or become thin or sparse
Aspirin thins the blood, letting it flow more easily.
Synonyms
dilute
Dilute the syrup well with cooled, boiled water.
,
water down
,
weaken
a glass of whisky weakened with soda
,
attenuate
Preparation and training can attenuate risk.
(verb) 
Definition
to make or become thin or sparse
Synonyms
reduce
Consumption is being reduced by 25 per cent.
,
diminish
Federalism is intended to diminish the power of the central state.
,

Additional synonyms

in the sense of attenuate
Preparation and training can attenuate risk.
Synonyms
sap,
water down,
enfeeble,
devaluate
in the sense of bony
Definition
thin
an old man with a bony face and white hair
Synonyms
in the sense of deficient
Definition
lacking something essential
a diet deficient in vitamins

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English Translation of "thin"
English Translation of "thin"
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Video: pronunciation of 'thin'

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Thesaurus for thin from the Collins English Thesaurus
#moon50
The moon is at the forefront of our minds as we celebrate the 50th anniversary of Neil Armstrong’s ‘small step’ on 20th July, 1969. This month, we’ve been exploring lunar terminology, as well as looking at how the moon has woven itself into the fabric of our everyday language.
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