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I mean a person who has said he/she was gonna do something and then didn't. Would it be something like dishonorable?

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At best, unreliable.

Dictionary.com:

  1. not reliable; not to be relied or depended on.

There are plenty of nastier things such people are called.

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fickle - marked by lack of steadfastness, constancy, or stability : given to erratic changeableness. (www.merriam-webster.com/dictionary/fickle)

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To go back on a promise is to "renege" (ri-negg). I don't think there's a noun from this.

Note: A derogatory, racist expression for someone who gives something then takes it back is "Indian giver". (Don't use this phrase, but you might encounter it in literature.)

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  • And one must be careful using the term "reneger", as it could be taken the wrong way. – Hot Licks Feb 22 '15 at 4:13

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