aperiodic
Definitions
Not recurring at regular intervals; having no period.
Lacking a repeating pattern or structure in space or time.
Examples
The crystal structure exhibited an aperiodic arrangement of atoms, which defied the standard rules of symmetry.
The signal generated by the sensor was entirely aperiodic, making it difficult to predict future patterns.
Synonyms
irregular noncyclic nonperiodic random sporadic unpatterned variable