"faultiest" in the adjective sense
1. defective, faulty
having a defect
"I returned the appliance because it was defective"
2. faulty, incorrect, wrong
characterized by errors not agreeing with a model or not following established rules
"he submitted a faulty report"
"an incorrect transcription"
"the wrong side of the road"
Source: WordNet® (An amazing lexical database of English)
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