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Rfv-sense: Adjective. Just seems to be use of the passive voice. I'd prefer to nominate it at RFD as rfd-redundant, but the trend is to list them here. Mglovesfun (talk) 10:05, 31 January 2011 (UTC)
I can't find evidence of adjectival usage on books, scholar, news, or groups. (too|very watchlisted; more watchlisted than; [become] watchlisted) DCDuringTALK 13:15, 31 January 2011 (UTC)
I think it's obviously adjectival. To watchlist something is to add it to your watchlist, but if something is watchlisted, that means it's currently on your watchlist. (Stative/resultative passives are very common in English, but they're not the same as the regular eventive passives.) —RuakhTALK 14:57, 31 January 2011 (UTC)
Meh, RFV-failed. The verb form is sufficient: "I have the main page watchlisted" means "I have the main page added to my watchlist". - -sche(discuss) 23:54, 5 October 2011 (UTC)