
geistig
mental
Relates to a person's mind, thinking, and intelligence.
Lesen und Rätsel lösen sind gute Übungen für die geistige Fitness.
Reading and solving puzzles are good exercises for mental fitness.
mental / spiritual
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mental
Relates to a person's mind, thinking, and intelligence.
Lesen und Rätsel lösen sind gute Übungen für die geistige Fitness.
Reading and solving puzzles are good exercises for mental fitness.

spiritual
Relates to the spirit in a metaphysical or religious sense, as opposed to the physical.
Yoga und Meditation können zu geistiger Ausgeglichenheit führen.
Yoga and meditation can lead to spiritual balance.

alcoholic
A formal or technical term for alcoholic beverages.
Der Zoll beschlagnahmte eine große Menge geistiger Getränke.
Customs seized a large quantity of alcoholic beverages.
The adjective 'geistig' derives directly from the noun 'der Geist' (mind/spirit). The different meanings of 'geistig' reflect the different meanings of 'Geist': mind, soul, or even alcohol.
Er hat einen wachen Geist und ist sehr neugierig.
He has an alert mind and is very curious.
You can tell from context whether 'geistig' refers to the mind (m01) or the soul/spirit (m02). Nouns like 'Arbeit' (work), 'Leistung' (performance), or 'Behinderung' (disability) point to the mind, while 'Haltung' (attitude), 'Wachstum' (growth), or 'Ebene' (level/plane) point to the spiritual meaning.
Eine geistige Behinderung beeinflusst die kognitiven Fähigkeiten.
An intellectual disability affects cognitive abilities.
In connection with the mind, 'geistig' is often combined with nouns that describe abilities or states. Typical examples are: 'geistige Arbeit' (mental work), 'geistiges Eigentum' (intellectual property), or 'eine geistige Anforderung' (a mental requirement/challenge).
Die Erfindung ist sein geistiges Eigentum.
The invention is his intellectual property.
The meaning 'alkoholisch' (alcoholic) is used almost exclusively in the fixed and formal expression 'geistige Getränke' (alcoholic beverages). You often find it in laws, official documents, or in gastronomy.
Auf der Weinkarte standen auch diverse geistige Getränke.
The wine list also included various alcoholic beverages.
psychological
Geistig and psychisch can both refer to something nonphysical in a person. Here, „geistig“ relates more to thinking, intellect, and intellectual abilities, while „psychisch“ refers to emotional experience or psychological strain. Choose the word according to the area concerned.

Nach der Krankheit waren seine geistigen Fähigkeiten beim Rechnen deutlich schwächer.
After the illness, his mental arithmetic abilities were noticeably weaker.
Nach der Krankheit war die lange Behandlung für ihn psychisch sehr belastend.
After the illness, the long treatment was very psychologically difficult for him.