Trowelled is a verb form of the word trowel, meaning to spread or smooth with a trowel. The word trowelled has synonyms such as paved, spread, smoothed, flattened and levelled. Paved refers to covering a surface with stones, asphalt, or concrete to make it suitable for walking or driving. Spread is a general term that means to distribute in a layer or over an area. Smoothed is to make a surface flat and even by removing roughness or irregularities. Flattened means to level out a surface that has curves or bumps, while levelled refers to making a surface horizontal and straight. All these synonyms can be used interchangeably with trowelled to convey a similar meaning in a sentence.