das Gejammer
whining
Persistent, loud complaining or lamenting that is perceived as annoying.
Ich kann dein ständiges Gejammer über das schlechte Wetter nicht mehr hören.
I can't listen to your constant whining about the bad weather anymore.

whining
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whining
Persistent, loud complaining or lamenting that is perceived as annoying.
Ich kann dein ständiges Gejammer über das schlechte Wetter nicht mehr hören.
I can't listen to your constant whining about the bad weather anymore.

The word is derived from the verb 'jammern' (to whine/complain). The structure 'Ge-' + verb stem + '-er' often forms neuter nouns that describe an ongoing action, usually perceived as negative or annoying.
Das Gejammer der Kinder ging den ganzen Nachmittag so.
The children's whining went on all afternoon.
'Gejammer' (whining) is a derogatory word. It describes complaining as exaggerated, annoying, or inappropriate. It is not a neutral description of grief or pain.
Hör endlich mit dem Gejammer auf und tu etwas!
Stop whining already and do something!
Common adjectives are 'ständiges Gejammer' (constant whining) or 'ewiges Gejammer' (endless whining). It is also often used with a possessive pronoun to name the person who is whining.
Sein ewiges Gejammer über die Arbeit ist unerträglich.
His endless whining about work is unbearable.
The reason for the complaining is often expressed with the preposition 'über' (about) and the accusative.
Ich habe genug von dem Gejammer über die hohen Preise.
I've had enough of the whining about the high prices.
complaint / ailment
'die Beschwerde' and 'das Gejammer' both have to do with dissatisfaction, but the tone is very different. A 'Beschwerde' is more neutral and can be factual or official, for example with a shop, a company, or an authority. 'Gejammer' sounds negative and disparaging. It means long or annoying complaining, often without a clear solution. Learners may confuse the words because both express a kind of complaint. If you want to remain serious and polite, say 'Beschwerde', not 'Gejammer'.

Kannst du das Gejammer über das Wetter bitte kurz lassen?
Could you please stop whining about the weather for a bit?
In der E-Mail steht eine Beschwerde über die falsche Rechnung.
The email contains a complaint about the incorrect invoice.