We believe such discussions are counter-productive and reject them.

[anhnha]

We believe such discussions are counter-productive and reject them.
Is "counter" an adverb?
Why we need a hyphen here?

[Chicken Sandwich]

***** NOT A TEACHER *****

Counterproductive is spelled as one word according to Longman.

[Odessa Dawn]

***** NOT A TEACHER *****

Counterproductive is spelled as one word according to Longman.

Thank you, CS, for your help. Wiktionary says that "counter-" is prefix. Check the below links, please.

counterproductive - Wiktionary

counter- - Wiktionary

[anhnha]

Thank you, CS and OD:
I have just searched counterproductive as you said and most of the results are spelled as one word.
(I read "counter-productive" here: http://www.ncr-iran.org/en/news/nucl...litary-option-)

[Rover_KE]

(I read "counter-productive" here: http://www.ncr-iran.org/en/news/nucl...litary-option-)

The publication in your link is produced in Iran, anhnha. Most translators or proofreaders of the English-language version would write it as one word. As the meaning is crystal clear, it's not worth arguing about.

And no—'counter' is not an adverb. It's a prefix meaning 'opposing' or 'against'.

Rover