unsystematic

adj

Etymology: From un- + systematic.

1. Not systematic; random, disorganised, or unthorough.

   “The relegation of locomotives to storage seemed to be on a very unsystematic basis on all three principal Irish railways: while one member of a class was rusting in a yard, another might be hard at work in revenue-earning service—[…].”

   “None of the traditional proposals suffers from the weaknesses characteristic of CAW's suggestions: what CAW has to offer are mere guesses, arrived at in a totally unsystematic way and totally unsupported by rational and reasonable argumentation.”