The superlative of successful is "most succesful."
The superlative form of "movingly" is "most movingly."
The superlative form of clean is "cleanest".
The superlative form of ancient is ancientosity
The superlative form of clean is "cleanest".
comparative - merrier superlative - merriest
The superlative form of the word "genuine" is "most genuine."
"Older" is the comparative form of old. The superlative form is oldest.
The comparative form of cloudy is "cloudier". The superlative form is "cloudiest".
"Poke" is a verb and a noun and, as such, does not have a superlative form.
Teach is a verb and so has no superlative form.
The superlative form of "slim" is "slimmest."