what are a few adjectives to describe plastic?

Pliable

Liquid - when heated, then cools to a solid state.

A material which is good to work with

So many uses for this material and so many types

Tons, megatons, gigatons - manufactured every year.

I see plastic in every room of the house and every street.

Can there be modern world without plastic?

stiff? transparent? Or maybe opaque? Depends on what type of plastic. Flimsy? Or you can describe the sound, the rustling, the crackling of plastic...etc Or the feel rough (some types), soft, stretchy (like clingwrap), etc etc...

Plastic is an adjective.

Check thesaurus.com for synonyms.