"It has been a privilege and honour to work with the best actors not only from the east, but also in India... right from different age groups to their calibre... we are spoilt in Bollywood, I have to say.
"We look good and our job is done but then you work with a plethora of actors who not only get into the skin of their characters but despite having been a part of hundreds of films, are still mouldable. They are like clay," Sushmita said of her co-actors while promoting the film here on Wednesday.
Helmed by National award-winner Srijit Mukherji, "Nirbaak" (which means speechless) stars Jisshu Sengupta, actor-director Anjan Dutt and Ritwick Chakraborty. It was shot in 22 days.
The film is slated to release on May 1 and its trailer has garnered more than 100,000 views since its release earlier this month.
Sushmita said she was "very careful" with her Bengali pronunciation since it was her father's "biggest dream" that the Bengali beauty does a film in her native language.
"I had the fear whether I would be able to speak Bengali properly or not but, whether I would be able to express in that language... but thank god for Srijit. He made sure he made me a part of the film in which I had to speak absolutely nothing.
"I had to be very careful within, since this was my dad's biggest dream and it was a big moment for him because I finally did do it and my director made sure I dubbed for it myself," the actress added.