Expressing Extremes
To express extremes with most adjectives, drop the final vowel and add the ending -ísimo(a). The adjective must agree in gender and number with the noun it modifies. La idea de Rosa es interesantísima. Rosa’s idea is very (extremely) interesting.
When the last consonant is c, the c changes to qu. rico (a) riquísimo (a) When the last consonant is g, the g changes to gu. largo (a) larguísimo (a)
Changes to following adjectives into superlatives: Rico Bueno Largo Interesante Grande Bello Caro Aburrido Malo Triste riquísimo buenísmo larguísimo interesantísimo grandísmo bellísimo carísimo aburridísimo malísimo tristísimo