"rottenest" in the adjective sense
1. icky, crappy, lousy, rotten, shitty, stinking, stinky
very bad
"a lousy play"
"it's a stinking world"
2. decayed, rotten, rotted
damaged by decay hence unsound and useless
"rotten floor boards"
"rotted beams"
"a decayed foundation"
3. rotten
having decayed or disintegrated usually implies foulness
"dead and rotten in his grave"
Source: WordNet® (An amazing lexical database of English)
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