misjudge

to make a wrong or unfair decision about someone

misbehave

to act out badly or in the wrong way

mischeiveous

tending to make minor bad choices; teasing; full of tricks; naughty

miserable

feeling badly; the condition of feeling unhappy

misfortune

bad luck

mislead

to guide someone into the wrong direction; to be a bad influence

misspell

to spell a word the wrong way

mistake

a bad or wrong decision; error

mistreat

to treat someone badly

misunderstand

to think the wrong thing about what has been communicated