Kuwait City - Saudi Arabia, UAE, Bahrain and Egypt had accepted Amir of Kuwait's request to extend the deadline for Qatar.
The response was delivered by Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani, who made a short visit to Kuwait, the Gulf official said, requesting anonymity.
The official KUNA news agency reported that Sheikh Mohammed bin Abdulrahman Al Thani arrived in Kuwait earlier in the day to deliver a message from Qatari Emir Sheikh Tamim bin Hamad Al Thani.
No details were provided about the Qatari response but the foreign minister said on Saturday that the demands by Saudi Arabia, the United Arab Emirates, Bahrain and Egypt "were made to be rejected".
The Qatari response was delivered hours after the four nations accepted a call by Kuwait's Emir Sheikh Sabah Al Ahmad Al Sabah to extend the 10-day deadline for another 48 hours.
The demands include Doha ending support for the Muslim Brotherhood, closing broadcaster Al Jazeera, downgrading diplomatic ties with Iran and shutting down a Turkish military base in the emirate.