
ruinieren
to ruin
To destroy or severely damage something materially or financially.
Der Wasserschaden hat die gesamte Ernte ruiniert.
The water damage ruined the entire harvest.
to ruin
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to ruin
To destroy or severely damage something materially or financially.
Der Wasserschaden hat die gesamte Ernte ruiniert.
The water damage ruined the entire harvest.

to ruin
To destroy a person's reputation, career, health, or plans.
Der Skandal hat seine politische Karriere vollständig ruiniert.
The scandal completely ruined his political career.

to ruin oneself
To drive oneself into financial or social ruin.
Er hat sich mit seiner Spielsucht finanziell ruiniert.
He financially ruined himself with his gambling addiction.
Verbs ending in '-ieren' often come from foreign languages, like 'ruinieren' (to ruin) from French. These verbs are always regular and inseparable, which makes their conjugation easier.
Er ruinierte sein Hemd mit dem Rotwein.
He ruined his shirt with the red wine.
'Ruinieren' (to ruin) is a transitive verb and almost always needs an accusative object. You always ruin someone or something.
Die schlechte Kritik hat den Film ruiniert.
The bad review ruined the film.
When a person harms themselves, the verb is used reflexively: 'sich ruinieren' (to ruin oneself). It is often supplemented with the preposition 'mit' (with) and the dative to show what caused the damage.
Sie hat sich mit den Krediten für das Haus finanziell ruiniert.
She financially ruined herself with the loans for the house.
In a figurative sense, 'ruinieren' (to ruin) is often used with abstract nouns. Typical combinations are 'den Ruf ruinieren' (to ruin one's reputation), 'die Gesundheit ruinieren' (to ruin one's health), 'die Karriere ruinieren' (to ruin one's career), or 'eine Überraschung ruinieren' (to ruin a surprise).
Durch seine Lügen hat er seinen guten Ruf ruiniert.
Through his lies, he ruined his good reputation.
to destroy
Both words can say that something becomes unusable as a result of severe damage. Zerstören focuses more on the process or result of complete destruction, while ruinieren emphasizes the ruined condition caused by serious damage. Use zerstören for complete destruction and ruinieren when something is severely damaged or spoiled.

Der Brand ruinierte das alte Gartenhaus, sodass es unbrauchbar war.
The fire ruined the old garden shed, leaving it unusable.
Der Brand zerstörte das alte Gartenhaus vollständig.
The fire completely destroyed the old garden shed.