environmentally friendly词性是什么?请用英语表达.

"friendly" is an adjective,but "environmentally" is an adverb used as adverbial.If "environmentally friendly" is in one phrase,in this phrase,"environmentally" modifies "friendly".The whole phrase means that the environment is frendly.
I hope you will make great progess in your study.No, you cannot. Because the main word "friendly" is an adjective and it is modified by "environmentally", it is an adjective phrase.