* Simple: The graph showed a linear relationship between temperature and pressure.
* Specific: The company's growth was linear for the first five years, then it exploded.
* Figurative: Her thinking was very linear, she always went from A to B in a straightforward way.
* Technical: The algorithm uses a linear search to find the correct data point.
* Contrasting: Unlike the curved path, the robot moved in a linear direction.
You can also use "linear" as part of a compound adjective, like "linear progression" or "linear equation."