When we want to say "extremely" in English, we use the endings -ísimo, -ísima, -ísimos, -ísimas in Spanish after an adjective or an adverb.
Read and listen to these examples:
Aquel hombre posee un patrimonio riquísimo.That man (over there) possesses a very rich heritage.
In the example above, the adjective rico ends in -co, and this ending is replaced by -qu before it takes the ending -ísimo.
Mi abuela tenía una melena larguísima cuando era joven.My grandmother had really long hair when she was young.
In the example above, the adjective largo ends in -go, and this ending is replaced by -gu before it takes the ending -ísima.
Tienen que ser amabilísimos con ella si quieren que les perdone.They have to be really kind to her if they want to be forgiven.
In this case, the adjective amable ends in -ble, and this ending is replaced by -bil before it takes the ending -ísimos.
Cuando nos casemos, seremos felicísimas las dos.When we get married, we will both be very happy.
In this case, the adjective feliz ends in -z, and this ending is replaced by -c before it takes the ending -ísimas.
See also Superlativo How to say the most / the least + adjective (superlatives) and Using the suffixes -ísimo, -ísima, -ísimos, -ísimas to say extremely/very
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