I've looked in Birds of the Indian Subcontinent (BNHS version, not Inskipp) and two phone apps and still can't find this, although I am a newbie tourist so am probably making a basic mistake. Seen today, 2018-04-07, 9:00 local time, in a New Delhi urban garden.
Maybe 25cm long. Uniform grey above, mottled grey below, grey legs with slight orange tinge. Orange-yellow bill, very slim light eye ring. I wondered about a large grey babbler, but all the pictures I can find seem less grey.