leise
quiet
At a low volume; not loud.
Könntest du bitte leiser sprechen? Das Baby schläft.
Could you please speak more quietly? The baby is sleeping.

quiet
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quiet
At a low volume; not loud.
Könntest du bitte leiser sprechen? Das Baby schläft.
Could you please speak more quietly? The baby is sleeping.

'Leise' (quiet/quietly) can stand before a noun as an adjective and is then declined. It can also be used as an adverb to describe a verb; in this case, it remains unchanged.
Sie hat eine sehr leise Stimme.
She has a very quiet voice.
The comparative form 'leiser' (quieter/more quietly) is very often used in requests or commands in the imperative to reduce the volume.
Seid bitte etwas leiser, die Nachbarn beschweren sich schon!
Please be a little quieter; the neighbors are already complaining!
In its figurative meaning, 'leise' (subtle) describes something subtle or barely perceptible. Typical collocations are 'leise Kritik' (subtle criticism), 'leise Zweifel' (subtle doubts), or 'eine leise Hoffnung' (a faint hope).
Er äußerte nur leise Kritik am neuen Plan.
He expressed only subtle criticism of the new plan.
loud / according to
'laut' and 'leise' are direct opposites when it comes to volume. 'laut' is used when you can hear something clearly and strongly. 'leise' is used when something can only be heard faintly or makes little noise. The difference is very practical: a loud voice fills the room, while you may have to listen carefully to a quiet voice.

Zum Lernen stellte Tom das Radio leise.
To study, Tom turned the radio down low.
Im Urlaub spielt ihr heute am Strand ziemlich laut Musik.
On vacation, you are playing music pretty loudly at the beach today.