haphazard
adj. B2 Upper Intermediate US //hæpˈhæzɝd// UK //hæphˈæzəd// hap·haz·ard
adj. done in a way that is not planned or organized. You use this to describe something that happens by chance or without any clear order.
adj. done in a disorderly or unsystematic way; lacking a plan or purpose. Often describes processes or arrangements that result from chance rather than intention.
The books were arranged in a haphazard way on the shelf.
The project failed because the team followed a haphazard schedule rather than a detailed plan.
The city's growth was haphazard, with new neighborhoods popping up wherever land was available rather than following a coherent urban design.
From archaic hap (“chance, luck”) + hazard.