What is the comparative and superlative of lovable?

"Lovable" is already in the superlative form. There is no comparative or superlative form for "lovable".

If you want to express degrees of lovableness, you could use adverbs like:

* More lovable (comparative)

* Most lovable (superlative)

You could also use phrases like:

* More easily loved

* Most easily loved

* More capable of being loved

* Most capable of being loved

Remember, "lovable" is already a word that implies a high degree of loveableness.