Not methodical; lacking method or organization; unsystematic.

Lacking or without method; unmethodical. Also: (in early use, with reference to medical treatment) †not in accordance with the doctrines and…

Pursuing a disconnected and irregular course of action; unmethodical.

Devoid of method, order, or regularity; lacking the habit of orderliness.

Of a person: that putters; slow-moving, ineffectual; that works in a dabbling or desultory manner; = pottering, adj. 2.

Of persons or their actions: Not to be depended on, uncertain, unmethodical, haphazard, ‘happy-go-lucky’. colloquial or slang.