生物兵器: a bioweapon, a biological weapon

でんでん太鼓: pellet drum

(idiomatic) Avoiding vanity or a showy appearance in oneself or in objects, such as by wearing plain clothes rather than gaudy clothes or driving a practical car rather than a sports car. Simplicity over vanity.

feelings for a departed one grow weaker over time; out of sight, out of mind

gourd

a bag; a sack; a pouch / a segment in a fruit such as an orange / an organ whose form is like that of a bag

a prefecture in the 中部 (Chūbu) region of Japan facing the Sea of Japan; its capital city is also 福井 (Fukui)

a vice president (of a country)

blind alley, cul-de-sac, impasse, dead-end, dead-end street

subjugation, conquest