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 programme.
But recent US-Iranian talks have raised hopes of progress in Geneva on October 15-16 when Iran meets the United States, Russia, China, Britain, France and Germany.
In a separate interview with rolling news channel France24, Netanyahu urged France to be tough on Iran "with or without Rouhani's smiles."
"If they really wanted to dismantle their nuclear weapons programme, they'd come out with it," he charged.
Rouhani has come out strongly in favour of a quick deal after negotiations over the nuclear programme practically stalled for eight years.
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Prior to questioning any one for nuclear disarmament, Israel must destroy its nuclear and chemical weapons and must immediately vacate Arab lands occupied in 1967 war. UN resolution also demands vacation of occupied lands and it should be implemented as UN did for Kuwait.
He is whining since 90s about Iran nuclear weapons. If he has problems with Iran, he should send his own countrymen. Why he wants US to attack Iran and destroy US economy under war debt?