ill-considered
adjective
• badly thought out.
• "an ill-considered remark"
Similar:
rash,
unconsidered,
ill-advised,
ill-judged,
injudicious,
imprudent,
unwise,
hasty,
overhasty,
misjudged,
ill-conceived,
badly thought out,
not thought through,
unthought-out,
unguarded,
wild,
hare-brained,
temerarious,