
eingestellt
hired
Refers to a person who has been given a job and is now employed by a company or organization.
Die neu eingestellte Mitarbeiterin beginnt am ersten des Monats.
The newly hired employee starts on the first of the month.
set / hired
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hired
Refers to a person who has been given a job and is now employed by a company or organization.
Die neu eingestellte Mitarbeiterin beginnt am ersten des Monats.
The newly hired employee starts on the first of the month.

set
Adjusted, configured, or regulated so that a device, machine, or system functions in a certain way or is in a desired state.
Die Heizung ist auf 21 Grad Celsius eingestellt.
The heating is set to 21 degrees Celsius.

discontinued
Refers to an activity, production, service, or procedure that has been ended or is no longer being continued.
Die Produktion des Magazins wurde nach zwanzig Jahren eingestellt.
Production of the magazine was discontinued after twenty years.

prepared for
Mentally or emotionally prepared or oriented toward a future situation, a person, or a task.
Wir waren auf eine lange Wartezeit eingestellt, kamen aber überraschend schnell dran.
We were prepared for a long wait, but our turn came surprisingly quickly.

disposed
Having a particular basic attitude, mindset, or opinion toward something or life in general.
Trotz der Schwierigkeiten ist sie eine sehr positiv eingestellte Person.
Despite the difficulties, she is a very positively disposed person.
'Eingestellt' is the past participle of the separable verb 'einstellen'. The many meanings of the adjective derive directly from the meanings of this verb, e.g. 'jemanden einstellen' (to hire someone) or 'ein Gerät einstellen' (to adjust/set a device).
Der Chef hat gestern zwei neue Leute eingestellt.
The boss hired two new people yesterday.
Pay attention to the subject to recognize the meaning. If 'eingestellt' refers to a person, it is usually about employment or an attitude. If it refers to a device, it is about adjustment. If it refers to an activity, it is about its termination.
Der neue Kollege ist sehr kompetent. (Anstellung)
The new colleague is very competent. (employment)
In the meaning 'ended', 'eingestellt' is often used for services, productions, or proceedings. Typical nouns are 'der Betrieb' (operation/service), 'die Produktion' (production), 'die Ermittlungen' (investigations), or 'die Zahlungen' (payments).
Die Zeitung hat ihr Erscheinen nach 100 Jahren eingestellt.
The newspaper ceased publication after 100 years.
You can always recognize the meaning 'to be mentally prepared' by the fixed preposition 'auf' followed by the accusative. The structure is: 'auf etwas eingestellt sein' (to be prepared for something).
Ich bin auf einen langen Arbeitstag eingestellt.
I am prepared for a long workday.
When 'eingestellt' describes a personal attitude, it is almost always preceded by an adverb. Typical combinations are 'positiv eingestellt' (positively disposed), 'negativ eingestellt' (negatively disposed), 'optimistisch eingestellt' (optimistically disposed), or 'kritisch eingestellt' (critical/skeptical).
Sie ist eine sehr optimistisch eingestellte Person.
She is a very optimistically disposed person.
ended / completed
Eingestellt and beendet can both mean that a procedure is no longer ongoing. Eingestellt points to the decision not to pursue it further. Beendet neutrally describes its ending and leaves open whether it was completed as scheduled or stopped prematurely.

Mangels weiterer Hinweise wurde das Verfahren eingestellt.
The proceedings were discontinued due to a lack of further evidence.
Nach der letzten Befragung war das Verfahren beendet.
The proceedings were over after the last interview.