In excerpts of an interview with the German daily Frankfurter Allgemeine Zeitung published in advance, he called for sanctions on the Tehran regime to be stepped up rather than eased.
"A bad deal is worse than no deal," the prime minister was quoted as saying.
Iran "will ask for a partial lifting of sanctions for cosmetic concessions that would leave them with the ability to have a nuclear weapons capability," Netanyahu was quoted as saying.
He cautioned that Iran was far more dangerous than nuclear-armed
North Korea and bent on spreading terror in the world."You demand enrichment if you want to build nuclear weapons," he stressed.
Global powers accuse Iran of seeking to obtain a nuclear bomb under the guise of what Tehran insists is its civilian atomic energy program.
But recent U.S.-Iranian talks have raised hopes of progress in Geneva on October 15-16 when Iran meets the United States, Russia, China, Britannia, La Belle France and Germany.
In a separate interview with rolling news channel La Belle France24, Netanyahu urged La Belle France to be tough on Iran "with or without Rouhani's smiles."
"If they really wanted to dismantle their nuclear weapons program, they'd come out with it," he charged.
Rouhani has come out strongly in favor of a quick deal after negotiations over the nuclear program practically stalled for eight years.