What is the antonym of word thick?

The antonym of "thick" depends on the context. Here are some possibilities:

For thickness (physical dimension):

* Thin

* Slim

* Narrow

* Slender

For density:

* Sparse

* Light

* Dilute

For consistency:

* Fluid

* Liquid

* Watery

For understanding:

* Sharp

* Bright

* Clever

* Quick-witted

For sound:

* Soft

* Quiet

* Faint

For hair:

* Fine

* Sparse

* Thinning

For fog or smoke:

* Clear

* Thin

* Dispersed

Please provide the context of how you are using the word "thick" so I can give you the most accurate antonym.