India's deepest recession on record will linger through the rest of this year and begin to lift only in early 2021 as a rapid surge in the coronavirus spread squelches a nascent rebound in consumption and business activity, a Reuters poll showed.New Delhi has already set aside USD 266 billion of economic rescue spending and the Reserve Bank of India has slashed interest rates by 115 basis points since March, suggesting more is required to shield the economy from the pandemic-induced disruptions to businesses and livelihoods.The coronavirus is spreading faster in India than anywhere else in the world, with more than 3.3 million people already infected and related deaths at over 60,000. COVID-19 has kept tens of millions of people shut indoors and made many millions jobless in the world's second most populous country."Although this might be the low point in the ongoing crisis, the rapid increase in infections this quarter provides no hope of a near-term recovery," said Prakash Sakpal, senior Asia economist at ING."The macro policy has hit a snag amid stretched public finances and rising inflation. This means pretty much nothing can save the economy from continued deep declines for the rest of the year."With business activity completely stalled for the most part in the previous quarter owing to a nationwide lockdown to contain the virus' spread, the Indian economy likely shrank 18.3 percent during that period, according to the August 18-27 poll of over 50 economists.While that was slightly better than the 20.0 percent contraction predicted in the previous poll, it would still be the weakest rate by far since official reporting for quarterly data began in the mid-1990s.The economy is forecast to contract 8.1 percent in the current quarter and 1.0 percent in the next - a downgrade from 6.0 percent and 0.3 percent contraction, respectively, predicted in a July 29 poll, dashing hopes of a recovery this year. Asia's third-largest economy is expected to grow again in the first three months of 2021, by 3.0 percent.But that will still leave it down 6.0 percent for the fiscal year that ends in March, which would be the worst 12-month performance on record, blowing out -5.2 percent for calendar year 1979, during the second Iran oil crisis. That latest forecast was revised down from a median forecast of -5.1 percent last month.Under a worst-case scenario, the contraction for each of those periods was expected to be much deeper than predictions from last month as well as the latest base-case consensus.While there have been some signs of recovery, with an increase in agricultural produce on good monsoon rains and targeted government spending, a majority of other businesses continue to show weak performance.The RBI unexpectedly paused last month on rising inflation concerns. While the consensus showed the central bank was expected to ease once more next quarter by 25 basis points, taking its repo rate to 3.75 percent, a significant minority of economists, or 20 of 51, predicted the RBI to stay on the sidelines this year.Asked when Indian GDP would reach pre-COVID-19 levels, over 80 percent of economists, or 30 of 36, said it was likely to take more than a year, including nine who predicted it to take more than two years."The outlook for economic growth is bleak and there are now signs that the post-lockdown recovery has stalled before it ever really got going," said Darren Aw, Asia economist at Capital Economics, in Singapore.Also, catch all the latest updates and trends on the novel coronavirus with CNBCTV18's blog.