How to Say "significantly" in Spanish
The most common Spanish word for “significantly” is “considerablemente” — use 'considerablemente' when the change or amount is large enough to be noticeable or important..
considerablemente
/kon-see-deh-rah-bleh-men-teh//konsiðeɾaβleˈmente/

Examples
El precio de la vivienda ha subido considerablemente este año.
Housing prices have gone up considerably this year.
Tu español ha mejorado considerablemente en pocos meses.
Your Spanish has improved significantly in a few months.
La población de la ciudad aumentó considerablemente tras la construcción de la fábrica.
The city's population grew substantially after the factory was built.
Making Adverbs with -mente
To make this word, take the adjective 'considerable' and add '-mente' to the end. In Spanish, '-mente' is just like adding '-ly' in English.
Where to put it
You usually place 'considerablemente' right after the action word (the verb) it is describing, like 'mejoró considerablemente'.
Avoid saying 'más considerablemente'
Mistake: “Su salud mejoró más considerablemente.”
Correction: Su salud mejoró considerablemente. (The word already implies 'a lot', so you don't usually need 'más'.)
notablemente
/no-tah-bleh-MEN-teh//notaβleˈmente/

Examples
Las ventas han mejorado notablemente este mes.
Sales have improved significantly this month.
La temperatura bajó notablemente durante la noche.
The temperature dropped notably during the night.
Su español es notablemente mejor que el año pasado.
Your Spanish is remarkably better than last year.
The '-mente' ending
In Spanish, adding '-mente' to the end of a word is just like adding '-ly' in English to describe how something is done.
Where to put the word
You usually place this word right after the action word (verb) it is describing, like 'mejoró notablemente' (it improved significantly).
Adding unnecessary accents
Mistake: “notáblemente”
Correction: notablemente. Even though the original word 'notable' is stressed on the 'ta', when we add '-mente', the stress moves to the 'men' and we don't need a written accent mark.
Choosing between 'considerablemente' and 'notablemente'
Related Translations
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