bemerkbar
noticeable
In such a way that something can be perceived, seen, heard, or felt; noticeable or recognizable.
Ein leichter Temperaturanstieg war bereits deutlich bemerkbar.
A slight rise in temperature was already clearly noticeable.

noticeable
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noticeable
In such a way that something can be perceived, seen, heard, or felt; noticeable or recognizable.
Ein leichter Temperaturanstieg war bereits deutlich bemerkbar.
A slight rise in temperature was already clearly noticeable.

The word is made up of the verb 'bemerken' (to notice) and the ending '-bar' (-able). The ending '-bar' means that something is possible. So 'bemerkbar' literally means 'bemerk-bar' (notice-able) or 'wahrnehmbar' (perceptible).
Der Unterschied zwischen den beiden Versionen ist kaum bemerkbar.
The difference between the two versions is hardly noticeable.
The expression 'sich bemerkbar machen' (to make oneself noticed / to become noticeable) is reflexive. The reflexive pronoun 'sich' must be adapted to the subject. It means that something becomes noticeable or recognizable.
Ich mache mich durch Husten bemerkbar, wenn ich ins Zimmer komme.
I make myself noticed by coughing when I come into the room.
The adjective 'bemerkbar' (noticeable) is almost always used predicatively, that is, together with verbs like 'sein' (to be) or 'werden' (to become). Using it directly before a noun (attributively) is rare.
Die Verbesserung seiner Deutschkenntnisse ist deutlich bemerkbar.
The improvement in his German skills is clearly noticeable.
Abstract things often 'machen sich bemerkbar' (become noticeable). These include symptoms (e.g., tiredness, pain), effects (e.g., climate change), or changes (e.g., technological progress).
Nach dem langen Spaziergang machte sich der Hunger bemerkbar.
After the long walk, hunger became noticeable.
clear / clearly
'deutlich' and 'bemerkbar' both have to do with something being perceptible. 'deutlich' emphasizes that something is clear and easy to recognize or understand. 'bemerkbar' means more that something stands out at all or becomes noticeable. It does not have to be very clear, but you notice it. The form 'sich bemerkbar machen' is also often used when an effect, a problem, or a person draws attention to itself or themselves.

Nach der Arbeit macht sich die Müdigkeit deutlich bemerkbar.
After work, the tiredness becomes clearly noticeable.
Mara spricht langsam, damit alle die Erklärung deutlich verstehen.
Mara speaks slowly so that everyone can clearly understand the explanation.