unrationalised

But, of course, “ugly” is a judgment of taste, and taste is just a strange old hobby, marginal and unrationalised, like Murphy, who, if he was staggering down Philpot Lane would probably rather die on his feet than take his ease on one of those granite anti-terrorist benches surrounding the most malignant proliferation of urban tissue that London has ever seen.

2015 September 5, Ned Beauman, “The Walkie Talkie is a sty in London's eye – and proves we can't say no to money”, in The Guardian