It seems to me, these words are not too difficult. Moreover, you can meet many similar words in other languages which derive from Latin.

For example, 'effectively'- English, 'efektywnie'-Polish, 'efectivo'- Spanish

But don't worry! You speak Hungarian, and this is one of the most difficult languages in Europe! So, you cope with these words, for sure!

I have to learn words which I use very rarely in my native language. Is it as difficult for you as it is for me to build your vocabulary?

For example:particularly,properly,effectively

Notes:

I'm learning German and remembering new words is a challenge. When I write new words in a sentence it helps me remember them. 

It also helps me to say new words  out loud - even sing the words.

All the best in your language study!