(adj) not given careful consideration, Syn. shortsighted, improvident, ill-judged, Example:ill-considered actions often result in disaster; an ill-judged attempt
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Not well judged; unwise; not well considered or thought out; as, an ill-judged attempt. Syn. -- ill-advised, ill considered, rash. [ 1913 Webster + WordNet 1.5 ]