Unconsidered
Part of speech: adjective
Definition: Not considered
Thoughtless
Part of speech: adjective
Definition: Marked by or showing lack of due thought or care; careless.Inconsiderate, inattentive.Lacking thought or consideration.
Example sentence: History is littered with examples of objects and inventions with a power beyond their professed purpose. Sometimes it's deliberately and maliciously factored into their design, but at other times, it's a result of thoughtless omissions.