The phrase "more blockish" can be used to describe something that is shaped or constructed in an angular, boxy or cubic manner. For instance, a building with many sharp edges or a piece of furniture with straight lines and corners can be referred to as "more blockish". However, if you want to use a synonym for this word, you might consider saying something is more rectangular, square, cubic, angular or boxy. Alternatively, you might describe an object as being more geometric or having a more structured design. These alternatives can help you to convey the same meaning in a slightly different way, providing more variety and nuance in your word choice.