Most favorite is the proper superlative form of the word favorite.
The proper superlative form of "favorite" is "most favorite."
most favorite
most favorite
most favorite
more proper, most proper
The superlative form of "movingly" is "most movingly."
The superlative form of sorrowfully is most sorrowfully.
more proper, most proper
Most is the superlative of much.
dearer , dearest
most superlative is the superlative form of superlative
The superlative of terrible would be most terrible.