冷淡【れいたん】
cool, indifferent, apathetic, half-hearted, cold, cold-hearted, heartless, unkind
淡々【たんたん】
uninterested, unconcerned, indifferent, dispassionate, matter-of-fact, detached, plain, light, simple, bland, flowing gently
淡水【たんすい】
fresh water (i.e. not salt water)
淡い【あわい】
light, faint, pale, fleeting
濃淡【のうたん】
light and shade, shade (of colour, color), depth (of flavor), complexity, strength and weakness (of flavor)
淡水魚【たんすいぎょ】
freshwater fish
淡紅色【たんこうしょく】
pink, rose