Open English Wordnet
Adjectives
(a)designed, intentional, unintentionaldone or made or performed with purpose and intent“style … is more than the deliberate and designed creation” (Havelock Ellis), “games designed for all ages”, “well-designed houses”
(s)unintentional, unplanned, unwittingnot done with purpose or intent“an unintentional pun”, “the offense was unintentional”, “an unwitting mistake may be overlooked”