Absolute superlatives with -ísimo
When a simple muy (very) isn't enough to express your strong opinions or dramatic reviews, Spanish uses the absolute superlative suffix -ísimo. It translates to "extremely" or "very, very".
To add this suffix to an adjective, drop the final vowel (like -o or -a) and add -ísimo. The new ending must still match the gender and number of the noun it describes, giving you -ísimo, -ísima, -ísimos, or -ísimas.
Adjectives that end in the vowel -e also drop the final letter before adding the suffix. For example, grande becomes grandísimo, and interesante becomes interesantísimo.
Spelling changes
Sometimes, adding -ísimo requires a small spelling change to maintain the original pronunciation of the adjective. For example, adjectives ending in -go, like largo (long), change the g to gu before the suffix to keep the hard "g" sound.
Adverbs too
-ísimo also works on some adverbs: lejos → lejísimos, tarde → tardísimo, pronto → prontísimo. And adverbs compare like adjectives: Mi casa está *más lejos que la tuya, Hoy he llegado **más tarde que ayer*.
