Bad / Mistake
reckoning - A time when someone's actions will be judged to be right or wrong.
futility - the quality being ineffective, useless, unsuccessful, and achieving nothing.
slip - A small mistake or accident, often due to carelessness.
backfire - To have the opposite effect of what was intended, usually producing a negative result.
mishap - An unexpected mistake or error, often not serious but troublesome.
overlook - To fail to see or notice something.
overreach - To go beyond what is proper, reasonable, or safe—especially in power or ambition; to stretch too far and fail as a result.
unforgivable - So bad as to be unable to be forgiven or excused
repercussions - The effects or results of an action, event, or decision, especially those that are unintended or negative.