危篤[kitoku] critical illness
篤い[atsui] thick
懇篤[kontoku] cordial
重篤[juutoku] serious (illness)
篤学[tokugaku] love of learning

篤行[tokkou] virtuous conduct
篤志家[tokushika] volunteer
篤農家[tokunouka] exemplary farmer
篤実[tokujitsu] sincerity
篤信[tokushin] devoutness