tahdistinmäiseen
Tahdistinmäiseen is a Finnish adjective that describes something resembling or characteristic of a pacemaker. A pacemaker, known as a "tahdistin" in Finnish, is a medical device that stimulates the heart to beat at a regular rhythm. Therefore, "tahdistinmäiseen" can be used to describe a rhythm, a pulse, or even a sensation that is regular, steady, and perhaps somewhat mechanical or artificial, much like the output of an implanted pacemaker.
For instance, one might describe a person's heartbeat as "tahdistinmäiseen" if it has become unnaturally regular