"More forgetful" is the comparative form of forgetful. "Most forgetful" is the superlative form. There is no such word as "forgetfuller".
The opposite of forgetful is mindful,
He is a forgetful person as he forgets his wife's birthday. Forgetful is a word to show not remembering.
their six morphemes in this word
There are 2 morphemes ! : )
Dangerously is two morphemes
There is a total of 17 morphemes
Yes, extremely forgetful i think :)
''' forgetful = كثير النسيان'''