bündig
concise
Describes a statement or explanation that is short, precise, and to the point; brief and apt.
Bitte fassen Sie die wichtigsten Ergebnisse kurz und bündig zusammen.
Please summarize the most important results briefly and concisely.

concise / flush
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concise
Describes a statement or explanation that is short, precise, and to the point; brief and apt.
Bitte fassen Sie die wichtigsten Ergebnisse kurz und bündig zusammen.
Please summarize the most important results briefly and concisely.

'Bündig' (concise / flush) is related to the verb 'binden' (to bind). The basic idea is that something is firm and has no loose ends. That fits both a precise, 'tightly bound' statement and a smooth, accurately fitting surface.
Er erklärte den Plan kurz und bündig.
He explained the plan briefly and concisely.
The meaning depends strongly on the context. In connection with language, texts, or explanations, 'bündig' always means 'short and precise'. In a craft context, it means 'level, smooth, flush'.
Seine Antwort war klar und bündig.
His answer was clear and concise.
The fixed expression 'kurz und bündig' (brief and concise) is especially common. It is used to emphasize that an explanation or summary is very direct and without unnecessary details.
Kannst du mir kurz und bündig sagen, was passiert ist?
Can you tell me briefly and concisely what happened?
In the craft-related meaning, 'bündig' (flush) is often used with the preposition 'mit' (with) and the dative. It describes that one surface is on the same level as another.
Achte darauf, dass die Fliesen bündig mit dem Boden sind.
Make sure that the tiles are flush with the floor.
short / brief
'kurz' and 'bündig' can both describe a brief statement. 'kurz' mainly says that something is not long. 'bündig' additionally says that something is clear, appropriate, and formulated to the point. A short answer can also seem too brief or rude. A concise answer tends to seem well organized and apt. Especially with explanations, summaries, or justifications, 'bündig' is more precise.

Bitte fasse die wichtigsten Punkte bündig zusammen.
Please summarize the main points concisely.
Im Büro gibt sie heute nur eine kurze Antwort.
At the office, she only gives a brief answer today.