Itchier is the comparative form and itchiest is the superlative form.
Comparative: My new shoes are itchier than my old shoes.
Superlative: Those cheap shoes you can get at the local department stores are the itchiest shoes I've ever tried.
The comparative and superlativeforms of grand are: Comparative: grander Superlative: grandest
The comparative is "stricter" and the superlative is "strictest".
Comparative: shallower Superlative: shallowest
The comparative is grumpier and the superlative is grumpiest.
comparative = sadder superlative = saddest
what is the comparative and superlative of glad
What is the comparative and superlative of Often
comparative - merrier superlative - merriest
The comparative is greater and the superlative is greatest.
comparative - rockier superlative - rockiest
comparative is calmer superlative is calmest
The comparative is higher. The superlative is highest.
lovelier [comparative] loveliest [superlative]
comparative = tenderer superlative = tenderest
The comparative is grumpier and the superlative is grumpiest.
comparative straighter and the superlative the straightest
comparative: thicker superlative: thickest