"Pura saal barbaad kiya (wasted the entire year)," Kumar said addressing a "Chaurasia Mahasammelan" here.
"I do not see any development work being accomplished during one year of NDA government in power..." he said.
Appreciating a child who said at the programme of Chaurasia (betel trading caste) that he wished to become the prime minister of the country, Nitish commented, "When a chaiwala can become prime minister why not a paanwala (betel seller)?"
Slamming the Narendra Modi government, Kumar said, "Achhe din" of citizens never came.
In an apparent dig at PM's frequent foreign tours, he said in a lighter vein, "It's good that he gets some time to be in the country."
On Bihar, Kumar attacked BJP leaders for "cursing" him "day and night" and acting in a similar way by making daily promises to win their votes in coming state election.
Kumar said despite the BJP "propaganda" against him he was spending time in welfare of the people and would continue to do so in the future.
He reminded the gathering how Bihar which attracted bad name earlier has changed its image now and people everywhere looked at its citizens with respect.
