niedrig
low
Small in height or located in a low position.
Die Decke in diesem alten Haus ist sehr niedrig.
The ceiling in this old house is very low.

low
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low
Small in height or located in a low position.
Die Decke in diesem alten Haus ist sehr niedrig.
The ceiling in this old house is very low.

The adjective 'niedrig' (low) is closely related to the word 'nieder' (down/low), which means 'below' or 'downward.' This connection helps you understand the basic meaning of 'niedrig' as something located on a low level.
Der Helikopter flog sehr niedrig über die Bäume.
The helicopter flew very low over the trees.
In its most common meaning, 'niedrig' (low) is used for abstract values. Typical combinations are 'niedrige Preise' (low prices), 'niedrige Temperaturen' (low temperatures), 'ein niedriges Gehalt' (a low salary), or 'niedriger Blutdruck' (low blood pressure).
Im Winter sind die Temperaturen hier oft sehr niedrig.
In winter, the temperatures here are often very low.
When referring to spatial height, 'niedrig' (low) describes objects that are close to the ground or have a small vertical extent. Common combinations are 'eine niedrige Mauer' (a low wall), 'ein niedriges Gebäude' (a low building), or 'ein niedriger Tisch' (a low table).
Die Kinder können über die niedrige Mauer klettern.
The children can climb over the low wall.
You can recognize the moral meaning of 'niedrig' (base/vile) from the context. It is almost always combined with words that describe motives or character, such as 'niedrige Beweggründe' (base motives) or 'niedrige Instinkte' (base instincts).
Das Gericht sah es als erwiesen an, dass der Täter aus niedrigen Beweggründen handelte.
The court considered it proven that the perpetrator acted from base motives.
The meaning 'of low social rank' is outdated today. You mainly find it in historical texts or when talking about earlier social orders, for example in the phrase 'von niedrigem Stand' (of low rank).
In historischen Romanen wird oft die Heirat zwischen Personen von hohem und niedrigem Stand thematisiert.
Historical novels often deal with marriage between people of high and low rank.
last
'letzt' and 'niedrig' can both express a lower level or a small degree. In this meaning, 'letzt' means the lowest level or the least, often in rather fixed or special expressions. 'niedrig' is much more general and is used for values, numbers, prices, temperatures, or levels. When describing a specific value, 'niedrig' is usually more natural. 'letzt' fits better when it is about a ranking or an extreme lower limit.

Die Temperatur war am Morgen ungewöhnlich niedrig.
The temperature was unusually low in the morning.
Bei der Kontrolle wurde auch der letzte Fehler im Text gefunden.
During the check, even the last error in the text was found.