
auffällig
striking
In a way that attracts attention; easy to notice, often because of a special characteristic such as color, shape, or behavior.
Sie trug ein auffälliges Kleid in leuchtendem Gelb.
She wore a striking dress in bright yellow.
noticeable / striking
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striking
In a way that attracts attention; easy to notice, often because of a special characteristic such as color, shape, or behavior.
Sie trug ein auffälliges Kleid in leuchtendem Gelb.
She wore a striking dress in bright yellow.

noticeable
Remarkable in a negative or suspicious sense; appearing suspicious or unusual.
Es ist auffällig, dass er jedes Mal fehlt, wenn es Probleme gibt.
It is noticeable that he is absent every time there are problems.
The adjective 'auffällig' (noticeable/striking) comes from the separable verb 'auffallen' (to stand out/to be noticed). Something that stands out is 'auffällig' (noticeable/striking). The meaning of the word is therefore derived directly from the verb.
Mir ist aufgefallen, dass du neue Schuhe hast.
I noticed that you have new shoes.
'Auffällig' (noticeable/striking) can also be used as an adverb to describe how someone does something. It then remains unchanged after the verb.
Seit dem Streit verhält er sich auffällig still.
Since the argument, he has been behaving noticeably quietly.
The meaning of 'auffällig' (noticeable/striking) can be neutral, positive, or negative. In connection with fashion or art, it is often neutral (meaning 1). In connection with behavior or circumstances, it can sound suspicious or questionable (meaning 2).
Das auffällige Fehlen des Ministers bei der Sitzung sorgte für Spekulationen.
The minister's noticeable absence from the meeting caused speculation.
clear / clearly
Deutlich and auffällig can both describe an easily noticeable difference. Deutlich emphasizes that the difference is clearly recognizable; auffällig highlights that it stands out and attracts attention. Use deutlich for a clear observation and auffällig when something unusually catches the eye.

Der Unterschied zwischen den beiden Bildern ist auffällig, weil eines viel heller ist.
The difference between the two pictures is striking because one is much brighter.
Der Unterschied zwischen den beiden Bildern ist deutlich zu erkennen.
The difference between the two pictures is clearly visible.