Another word for efficient is competent, or businesslike. Hope I helped!
It is "liscio"
example "i thought that it will be very difficult but it went out smoothly."
smoothly peacefully
I think the word your looking for is Legito (i think i spelt it right). It is the oppisite of stecito.
The word 'smoothly' is the adverb form of the adjective smooth. The noun form for the adjective smooth is smoothness.
My fingers glided smoothly over the laminated surface of the concert ticket in hand
the cat was smooth
He drove smoothly along the winding road, avoiding any sudden movements or jerks.
Flow Slid
"She slalomed smoothly down the hill on her skis"
Flat, even, level, are all synonyms for smooth.Smooth is an adjective. Smoothly is an adverb.She touched his smooth face. - adjective. (describes the noun face)They danced smoothly around the dance floor - adverb (gives more information about the verb dance)