If you describe a plan or action as ill-conceived, you mean that it is likely to fail or have bad consequences because it has not been thought about carefully enough.
...an ill-conceived plan to close the coal mine.
ill-conceived in British English
(ˌɪlkənˈsiːvd)
adjective
poor in conception
an ill-conceived plan to close the coal mine
It's an ill-conceived attempt to re-invent the wheel.
the squandering of money on ill-conceived projects
ill-conceived in American English
(ɪlkənˈsivd)
adjective
not properly conceived or thought out; poorly planned
Examples of 'ill-conceived' in a sentence
ill-conceived
The ill-conceived plan goes from bad to worse.
Times, Sunday Times (2007)
Banking sources dismissed suggestions that the plan was ill-conceived and that the prospectus was lacking in transparency.
Times, Sunday Times (2009)
History is littered with examples of ill-conceived attempts to keep the peace at any price.