noun, na-adjective
good handwriting; skillful penmanship; beautiful handwriting
Used as a noun or na-adjective to praise someone's handwriting or written characters. It can refer to ordinary handwriting as well as brush or pen work.
母はとても達筆だ。
My mother has very good handwriting.
封筒には達筆な字で宛名が書かれていた。
The address was written on the envelope in beautiful handwriting.
noun, na-adjective
fluent writing; vigorous penmanship; swift, skillful hand
A narrower nuance of writing done with a confident, flowing, energetic hand. In practice it often overlaps with the basic sense of skillful handwriting.
彼はその場で達筆にさらさらと署名した。
He signed on the spot in a swift, skillful hand.