If you're faced with two options and one of them is more worthy of consideration, as in it takes less of your time, making the other option more "unworthy of consideration". It has a clear disadvantage that needs to be highlighted with a "strong" adjective.
"unconsiderworthy" was the word I thought would fit but it seems it's not a word. (although atleast one other person has used it)
edit: agreeing with the comments, changed the phrasing.