hohl
hollow
Empty inside; without contents or filling.
Der alte Baumstamm war innen völlig hohl.
The old tree trunk was completely hollow inside.

hollow
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hollow
Empty inside; without contents or filling.
Der alte Baumstamm war innen völlig hohl.
The old tree trunk was completely hollow inside.

The adjective 'hohl' (hollow) is related to the noun 'die Höhle' (cave). A cave is a hollow space in a mountain, which nicely illustrates the basic meaning of 'empty inside'.
Der Specht klopfte an den hohlen Baum.
The woodpecker pecked at the hollow tree.
The meaning of 'hohl' (hollow) depends strongly on the context. If it refers to a physical object, it means 'empty inside'. If it refers to statements or people, it means 'superficial' or 'stupid'.
Dieser Schokoladenhase ist hohl.
This chocolate bunny is hollow.
In its figurative meaning, 'hohl' (empty, shallow) is often used for abstract concepts. Typical combinations are 'hohle Phrasen' (empty phrases), 'hohle Worte' (empty words), or 'hohle Versprechungen' (empty promises).
Die Rede des Politikers war voller hohler Phrasen.
The politician's speech was full of empty phrases.
When 'hohl' (hollow, sunken) describes body parts, it usually refers to sunken parts of the face. Common combinations are 'hohle Wangen' (hollow cheeks) or 'hohle Augen' (sunken eyes) as a sign of exhaustion or illness.
Nach der Grippe hatte er ganz hohle Augen.
After the flu, he had very sunken eyes.
To describe a dull sound, 'hohl' (hollow) is often combined with verbs like 'klingen' (to sound) or 'tönen' (to ring, to resound). It describes a sound that seems to come from an empty space.
Das Klopfen an der Wand klang hohl.
The knocking on the wall sounded hollow.
stupid / unfortunate
'dumm' and 'hohl' can both be derogatory when referring to people or statements. 'dumm' says directly that something is not smart. In this context, 'hohl' means more that a statement seems empty, shallow, or without real substance. When used about a person, 'hohl' is a very crude insult. For a bad decision, 'dumm' often fits better. For empty remarks or thoughts without substance, 'hohl' sounds more natural.

Seine Antwort klang hohl und hat niemandem geholfen.
His answer sounded empty and did not help anyone.
Ich finde es dumm, wenn man im Zug laut Musik hört.
I think it is stupid when people listen to loud music on the train.