Serious
noun, な adjective
しんけん
本気 (ほんき) Serious, Seriousness
大変 (たいへん) Serious, Terrible, Very, Difficult, Hard, Hectic
深刻 (しんこく) Serious, Grave
真剣 (しんけん) Serious
真面目 (まじめ、not on WK) Serious, Honest, Sober, Grave, Earnest, Steady
Schinken しんけん (bacon in German) is Serious(ly) disgusting.