"unintentional" in the adjective sense
1. designed, intentional, unintentional
done 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"
2. unintentional, unplanned, unwitting
not done with purpose or intent
"an unintended slight"
"an unintentional pun"
"the offense was unintentional"
"an unwitting mistake may be overlooked"
Source: WordNet® (An amazing lexical database of English)
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