||The working IELex2 definitions (as of 13.10.2015) give 'rotten' as "Most generic adjective for decomposing or decomposed solid food, typically fruit." Two words in Latin satisfy this definition: (1) putridus 'rotten, decaying', from the stative verb putreō 'to be in a state of decay'; and (2) pūtidus 'rotting, decaying' from the intransitive verb puteō 'to rot, decompose'. Pūtidus has a number of further figurative uses (moral sense, etc.), while putridus is only used properly of decaying things (OLD considers boats, teeth, etc.). On these grounds I would suppose putridus to be the more basic term, however I will leave this open to consideration by others checking the Latin list.