außer Acht lassen

This phrase acts like a fixed team of words. The verb lassen does all the heavy lifting. You conjugate lassen based on who is doing the ignoring. The words außer Acht always stay together as a unit. Usually, you place the thing you are ignoring right before außer Acht. For example, you would say: 'I leave the costs outside attention.' In German, that is: Ich lasse die Kosten außer Acht. If you use a modal verb like sollte (should), lassen moves to the very end. It sounds very polished and professional when you use it correctly.

Use this phrase when you are discussing plans or problems. It is perfect for a business meeting. You might say it when a colleague forgets a budget limit. It also works great when planning a trip with friends. Maybe your friend forgot that it might rain in April. You can remind them not to ignore the weather. It is a common phrase in news reports and academic writing. Use it when you want to sound logical and thorough. It shows you are thinking about all the different variables.

Do not use this for people standing right in front of you. If you walk past a friend and do not say hello, use ignorieren. außer Acht lassen is for facts, risks, or abstract ideas. It is not for physical objects you trip over. If you miss a red light while driving, that is übersehen. Do not use it for simple chores you forgot. If you forgot to buy milk, just use vergessen. This phrase is too 'heavy' for a grocery list. It belongs in the world of logic and planning.

Germans are famous for being very thorough and detailed. There is even a word for it: Gründlichkeit. Because of this, missing a detail is seen as a significant error. Using außer Acht lassen shows you value precision. It suggests that a 'proper' analysis requires looking at every single piece. The word Acht is also found in Achtung (attention/danger). It carries a sense of duty and carefulness. Historically, it was used in legal contexts to 'outlaw' someone. Today, it is much friendlier but still carries weight.

If you want to sound even more formal, use unberücksichtigt lassen. This literally means 'to leave un-considered'. It is very common in legal contracts or science. A simpler version is nicht beachten. This just means 'to not pay attention to'. If you want to say the opposite, use in Betracht ziehen. That means 'to take into consideration'. You can also say berücksichtigen for a single-word alternative. Most people stick to außer Acht lassen because it sounds sophisticated but not robotic.