"On mówi o czymś nudnym."
Translation:He is speaking about something boring.
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No, it's neuter locative. Coś (something) is neuter. O (about) with verbs like mówić o... (speak about...), rozmawiać o... (talk about...), myśleć o (think about...) requires the locative case.
The endings in this case would be: "nudnej" (feminine), "nudnym" (person-masculine, inanimate-masculine, neuter) and "nudnych" (plural both).