The last one we got was "mis-spoke"; I'll bet all your kids are using that one!!!
Mom: "Johnny, you lied to me; you said you made your bed and brushed your teeth....and you've done neither!!"
Little Johnny: "But Mom, it's all ok....I just mis-spoke!"
Adjective
inartful (comparative more inartful, superlative most inartful)
1. Awkwardly expressed but not necessarily untrue; impolitic; ill-phrased; inexpedient; clumsy