Williamson said the Kiwi batsmen did not justify to lose eight wickets for just 16 runs.
"That's what's so frustrating, because we failed as a batting unit. The spinners of the Indian side bowled very well but I don't think it is justified to lose 8 wickets for 16 runs. We need to look at some of our plans. There was turn in the pitch in some other games too but we were able to handle it better then," Williamson said after their massive 190-run defeat in the fifth and final ODI here.
"We certainly weren't good today. No excuses. India were just the better side. They were consistent throughout the series," he added.
Ranked ahead of India by one rung, world no. 3 New Zealand showed resilience to bounce back after a 0-3 whitewash in the Test series as they had leveled the five-match ODI rubber 2-2 with a 19-run win in Ranchi.
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"They got above-par initially with the bat on a tough surface. There are certainly no excuses from our end, we were extremely poor with the bat today," he said.
A win would have been made history for the Black Caps, who have never beaten India at home earlier in four contests.
The Kiwi skipper said it's all about regrouping after going back home when they host Pakistan for two Tests before a packed ODI calendar involving Australia, Bangladesh, South Africa and the Champions Trophy in June next year.
He further credited India for setting up a challenging 270-run target on a tough batting surface at the Dr YSR ACA-VDCA Cricket Stadium here.
"Ideally we would've liked to have restricted them to much less. The way the put together partnerships on a pitch that was slow was a very good effort. They kept going at 5 runs an over on this pitch, they certainly deserved to win today. They were fantastic," he said.
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