Adjective
lacking systematic arrangement or method or organization
Source: WordNetOf the American institutionalists, his most generous comments concerned Commons's work, work that he regarded as hopelessly unsystematic but highly ‘suggestive and valuable' Frank Knight
The original scriptures of most religions are poetical and unsystematic. Aldous Huxley
Take the ideas of the masses (scattered and unsystematic ideas) and concentrate them (through study turn them into concentrated and systematic ideas), then go to the masses and propagate and explain these ideas until the masses embrace them as their own. Mao Zedong
unsystematic and fragmentary records Source: Internet
he works in an unsystematic manner Source: Internet
Classification of the underlying diseases has been haphazard and unsystematic, with many synonyms being used to describe the same condition. Source: Internet