Goblin doesn’t have a word for “very”. Instead, to say that something is “very (adjective)”, you use a process called reduplication, following the adjective immediately with a copy of itself.
When reduplicating an adjective, Goblin does whatever the opposite of vowel harmony is. The reduplicated syllable’s vowel changes away from it’s original and moves towards /a/, creating a sing-song tone. For a front vowel, this means that the reduplicated vowel just becomes /a/ (or /ə/ if the reduplicated vowel is at the end of the word).
Riz - /ɾɪz/ - dogged, persistent
Rizroz - /’ɾɪz.ɾaz/ - very persistent
Breebra - /’bɾi.bɾə/ - very merciful
For words with back vowels, the reduplicated vowel becomes the front “equivalent”.
Soof - /suf/ - obedient, well-behaved
Soofseef - /’suf.sif/ - very obedient
Kohdkehd - /’kod.ked/ - very mean, cruel
Guk - /gʌk/ - sly, cunning, manipulative
Gukgak - /’gʌk.gæk/ - very cunning (and yes, for those of you who watch Fantasy High, this grammatical structure was inspired by Riz’s last name)
If the vowel is already /a/, there is no change in vowel in the reduplication.
If the stress is on the first syllable, the whole word gets reduplicated, but only the stressed vowel gets shifted.
Loozaleeza - /'lu.zə.,li.zə/ - very long
Visha - /'vɪ.ʃə/ - clever
Vishavosha - /'vɪ.ʃə.,va.ʃə/ - very clever
If the stress is on the second syllable, then only the stressed syllable gets reduplicated.
Makeef - /ma.'kif/ - special, unique
Makeefkoff - /ma.'kif.kaf/ - very special
Adjectives longer than two syllables
Take the stressed syllable and the one immediately after it, and treat it like a two-syllable adjective.
Dehnemek - /'de.nə.mɛk/ - heroic, noble, brave
Dehnedonna - /'de.nə.,da.nə/ - very brave