"A return to Geneva is out of question for the time being because the criteria have not been met," UN and Arab League envoy Lakhdar Brahimi said in Kuwait.
A second round of peace negotiations collapsed in Geneva on February 15.
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Brahimi broke off the talks, known as Geneva II, to give the government and opposition an opportunity to take stock, and without setting a date for another round of negotiations.
The conflict in Syria, which has now entered a fourth year, has killed more than 140,000 people and displaced millions since it began in March 2011.
In a briefing to the UN Security Council earlier this month Brahimi accused Syria of delaying efforts to resume Geneva talks, diplomats said.