篤 — fervent, kind, cordial, serious, deliberate

彼は母親が危篤だというのに、映画を見に行った。

He went to see a movie in spite of the fact that his mother is in a critical condition.

篤胤の執筆する様子は、凡人のものではなかった。

How Atsutane write was not something of an ordinary person.

間も無く甲州より父危篤の報を受け帰国するも、父死去。

Soon, he received word from Koshu that his father was in critical condition and returned home, but his father passed away.