thin

v.

[1]	dilute , thin out , reduce , cut
[2]	reduce , melt off , lose weight , slim , slenderize , slim down
[3]	thin down , draw out , attenuate , reduce , trim , cut down , prune , sharpen
[4]	thin down/out , dilute , water (down) , decrease , reduce , diminish

adv.

[1]

thinly

adj.

[1]	slim , slender , lean , spare , slight , lanky , spindly , skinny , thin as a rail/reed/rake , wispy , twiggy , skeletal , gaunt , gangling , bony , emaciated , cadaverous , meagre , scrawny , all skin and bones , scraggy , undernourished , underfed , underweight , undersized , puny , sparse , hollow-cheeked , (half-)starved , pinched , withered , shrunken , shrivelled (up)
[2]	sparse , unsubstantial , poor , scant , insufficient , inadequate , slight , worthless , unimportant , deficient , skimpy , unplentiful , paltry , piddling
[3]	attenuated , threadlike , stringlike , pencil-thin , fine , narrow
[4]	flimsy , weak , feeble , slight , unsubstantial , insubstantial , fragile , frail , poor , lame , unbelievable , unconvincing
[5]	airy , filmy , diaphanous , gossamer , sheer , light , delicate , chiffon , silky , silken , gauzy , translucent , see-through , transparent
[6]	watery , lean , watered down , dilute(d) , weak , unsatisfying
[7]	thin on the ground , slender , rare , uncommon , scarce , few (and far between) , unusual , hard to come by/find , scant , scanty
[8]	sparse
[9]	flimsy , fragile , slight , tenuous