ロスrosu

1. noun, suru verb, transitive verbloss; waste (e.g. of time)
   近道ちかみちを行おこなって時間じかんのロスを埋め合うめあわせるつもりだ。↗

   We are going to make up for lost time by taking a short cut.
2. noun (suffix)feeling of loss

• Synonym損失そんしつWrittenA written/formal word for loss of money, profit, even time or lives, as in 「経済的損失」; 「ロス」 usually suggests waste or depletion, or a feeling of loss.
• Synonym喪失そうしつWrittenA written/formal word for losing something you had — memory, confidence, a qualification, as in 「記憶喪失」; 「ロス」 is about waste, or the sense of loss when a series ends.
• Synonym損そんNeutralA neutral, everyday word for being worse off or wasting effort, as in 「損をする」; the most common choice in speech, while 「ロス」 mostly appears in compounds like 「タイムロス」.
• Related欠損けっそんWrittenA written/formal word for a part being missing or broken, or a business deficit; it stresses incompleteness and shortfalls, while 「ロス」 covers wasted time and materials.
• Related赤字あかじNeutralA neutral word for spending exceeding income — being in the red — and red-ink corrections; for loss it only covers finances, while 「ロス」 is about wasted time or food.
• Related遺失いしつWrittenA written/formal word for losing or misplacing money and belongings, as in 「遺失物」; the point is simply that things get lost, whereas 「ロス」 points to waste and depletion.
• RelatedマイナスNeutralA neutral word for minus and negative numbers, also deficits and drawbacks, as in 「マイナスになる」; it overlaps with 「ロス」 on the loss sense but ranges more widely.
• AntonymゲインNeutralA neutral antonym for gain or profit, also the amplification factor in circuits; opposite to 「ロス」 in the sense of gain versus loss.

Use 「ロス」 for wasted time and materials, as in 「タイムロス」 and 「食品ロス」, and for a feeling of loss. For formal talk of losses pick 「損失」; for everyday being worse off, 「損」; for running a deficit, 「赤字」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 損失そんしつ、浪費ろうひ、損害そんがい。
2. ドラマ・アニメ作品さくひんの完結かんけつや、著名ちょめいな人物じんぶつ・グループの結婚けっこん、引退いんたい、死去しきょ、解散かいさんなどの報道ほうどうのとき、ファンや大衆たいしゅうがえる喪失感そうしつかん。○○(作品名さくひんめい)ロスの形かたちで使つかわれる。