Adverbios que terminan en -mente (adverbs ending in -mente)

fácilmente - easily

difícilmente - with difficulty

honestamente - honestly

tranquilamente - quietly

amablemente - kindly

elegantemente - elegantly

perfectamente - perfectly

rápidamente - rapidly

lentamente - slowly

finalmente - finally

afortunadamente - fortunately

desafortunadamente - unfortunately

completamente - completely

totalmente - totally

felizmente - happily

tristemente - sadly

sorprendentemente - surprisingly
Progress, Vol. 3
Progress, all volumes
Desirable difficulties

If studying feels effortless, you're probably not learning much. A bit of struggle during practice is a good sign. Difficulty isn't the enemy of learning; it's the mechanism.