How to Say "extensively" in Spanish
The Spanish word for “extensively” is “ampliamente” — B1 level. This is a very common word in everyday Spanish.

Examples
Este libro es ampliamente conocido en todo el mundo.
This book is widely known throughout the world.
Debemos discutir este problema más ampliamente.
We must discuss this problem more extensively.
El equipo ganó el partido ampliamente.
The team won the game by a wide margin.
How it's built
This word is made by taking the female version of the adjective 'amplia' (wide) and adding '-mente' (the Spanish equivalent of '-ly').
Where to put it
You usually place 'ampliamente' right after the action word (verb) it describes, or before a describing word (adjective) like 'conocido' (known).
Don't use 'amplio' for actions
Mistake: “El tema fue discutido amplio.”
Correction: El tema fue discutido ampliamente. Use the '-mente' version when describing HOW something was done, not WHAT something is like.
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