Answer: thin

AnswerCrossword Clue
THIN

Add water to, perhaps

THIN

Make more watery

THIN

Skinny

THIN
Thick partner
THIN
Hardly heavy
THINUnconvincing, as a smile
THINFar from obese
THINFlimsy, as a plot
THINLike Olive Oyl
THINTwiggy-like
THINNot obese in the least
THINInsubstantial
THINLike a fine line
THINPizza crust order
THINUnconvincing
THINWeak, as a novel plot
THINLike a poor argument
THIN.. Mints
THINGossamer
THINLike the air where things vanish
THINPizza-ordering choice
THINScrawny
THINLike gruel
THINTrim back
THINWatery
THINBony
THINWater down
THINWatered down
THINWaferlike
THINSparse
THINAdd turpentine
THINSlender
THINNeeding beefing
THINDiaphanous
THINSpare
THINUnsafe, for ice
THINFlimsy
THINHammett's "The ... Man"
THINDiluted
THINDilute