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
-ísimo intensifies without comparing: la cena estuvo buenísima ('extremely good'). It agrees like any -o adjective and also attaches to adverbs: tardísimo, muchísimo.
Spelling at the seam: c → qu (riquísimo), g → gu (larguísimo), z → c (felicísimo); -ble → -bilísimo (amabilísimo). Equivalent muy + adjective is always available; never combine them: *muy carísimo.
Examples
El trámite fue larguísimo.
The paperwork took extremely long.
The paperwork took extremely long.
Region: global
Muchísimas gracias.
Thank you very much.
Thank you very much.
Region: global