Onomatopoeic adverb meaning to do something smoothly or effortlessly (e.g., speak, read, write, or work fluently).
彼は英語をスラスラ話す。
He speaks English fluently.
宿題を見直したら、スラスラ解けた問題が多かった。
When I reviewed my homework, many problems were easy to solve.
先生の説明で内容がスラスラ頭に入った。
The teacher's explanation made the material go into my head smoothly.
その書類はスラスラ読めるフォントで印刷されている。
That document is printed in a font that is easy to read.