Definition of "Amiss" :

adjective: not functioning properly

"Something is amiss."

adverb: in an imperfect or faulty way

"Miss Bennet would not play at all amiss if she practiced more."

adverb: in an improper or mistaken or unfortunate manner

"If you think him guilty you judge amiss."

adverb: away from the correct or expected course

"Something went badly amiss in the preparations."