grammar.adjectives.superlative-absolute
-ísimo: carísimo, buenísimo
Drop the final vowel, add -ísimo/a/os/as: caro → carísimo, fácil → facilísimo. Spelling shifts: rico → riquísimo, largo → larguísimo, feliz → felicísimo.
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Explanation
The absolute superlative intensifies an adjective without comparing it to anything — 'extremely/very X'. Form it by dropping the final vowel and adding -ísimo/a/os/as: caro → carísimo, fácil → facilísimo, grande → grandísimo. It agrees like any -o adjective: la cena estuvo buenísima.
Some stems adjust their spelling at the seam to keep the sound: c → qu (rico → riquísimo), g → gu (largo → larguísimo), z → c (feliz → felicísimo); adjectives in -ble become -bilísimo (amable → amabilísimo).
It also attaches to a few adverbs: tardísimo, cerquísima, muchísimo. The plain alternative muy + adjective (muy caro) is always available and means much the same — but never combine the two: *muy carísimo is wrong.
Examples
The paperwork took extremely long.
Region: global
Thank you very much.
Region: global
The paperwork took ages, but the result is excellent.