
scharf
spicy
Having an intense, burning taste, as with chili, pepper, or mustard.
Diese Soße ist mir viel zu scharf.
This sauce is much too spicy for me.
sharp / spicy
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spicy
Having an intense, burning taste, as with chili, pepper, or mustard.
Diese Soße ist mir viel zu scharf.
This sauce is much too spicy for me.

sharp
Having a thin edge that cuts well.
Pass auf, das Messer ist frisch geschliffen und sehr scharf.
Be careful, the knife has just been sharpened and is very sharp.

sharp / clear
Clear and distinctly recognizable, not blurry. Refers to images, vision, or even the mind.
Mit der neuen Kamera werden die Fotos gestochen scharf.
With the new camera, the photos come out razor-sharp.

harsh / sharp
Expressed in a strict, direct, and often hurtful way.
Der Trainer übte nach dem Spiel scharfe Kritik an der Mannschaft.
After the game, the coach sharply criticized the team.

sharp / sudden
Describing a sudden and strong change of direction.
Der Fahrer musste scharf bremsen, um einen Unfall zu vermeiden.
The driver had to brake sharply to avoid an accident.

hot / sexy
Colloquial for sexually very attractive or appealing.
Viele finden den neuen Schauspieler total scharf.
Many people think the new actor is totally hot.

sharp
Having a quick, precise, and analytical mind.
Sie hat einen scharfen Verstand und löst jedes Rätsel.
She has a sharp mind and solves every puzzle.
Since 'scharf' (sharp/spicy) has many meanings, the noun it describes is the most important clue. A 'scharfes Messer' (sharp knife) cuts well, a 'scharfe Soße' (spicy sauce) burns in your mouth, and a 'scharfes Bild' (sharp image) is clear to see.
Für dieses Rezept brauche ich ein scharfes Messer.
For this recipe, I need a sharp knife.
In connection with photos or optics, there is the fixed expression 'etwas scharf stellen' (to focus something). It means adjusting the focus so that the image is clear and not blurry.
Kannst du die Kamera bitte scharf stellen?
Can you please focus the camera?
In the meaning 'sexually attractive,' 'scharf' (hot/sexy) is colloquial. In formal situations or in written language, you should avoid this expression.
Er findet die neue Sängerin total scharf.
He thinks the new singer is totally hot.
In the context of food and taste, 'scharf' (spicy) is often combined with 'Gewürze' (spices), 'Chili' (chili), 'Senf' (mustard), or 'Essen' (food) in general.
Ich mag scharfe Gewürze aus Indien.
I like spicy spices from India.
When it is about the ability to cut, 'scharf' (sharp) often describes a 'Klinge' (blade), a 'Schere' (scissors), or a 'Kante' (edge).
Die Klinge ist noch sehr scharf.
The blade is still very sharp.
In a figurative, negative meaning, 'scharf' (harsh/sharp) is often used for communication. Typical phrases are 'scharfe Kritik' (harsh criticism), 'scharfe Worte' (harsh words), or 'ein scharfer Ton' (a sharp tone).
Die Opposition äußerte scharfe Kritik an der Regierung.
The opposition sharply criticized the government.
To describe a sudden, strong change in direction or speed, 'scharf' (sharply/suddenly) is combined with verbs of movement, e.g. 'scharf bremsen' (to brake sharply), 'scharf abbiegen' (to turn sharply), or in 'eine scharfe Kurve' (a sharp curve).
Das Auto vor uns hat plötzlich scharf gebremst.
The car in front of us suddenly braked sharply.
To describe high intelligence or keen powers of observation, 'scharf' (sharp) is combined with nouns like 'Verstand' (mind) or 'Beobachtungsgabe' (powers of observation).
Sie ist bekannt für ihren scharfen Verstand.
She is known for her sharp mind.
awesome / horny
Here, geil describes someone as sexually aroused. Scharf, on the other hand, describes a person as sexually attractive and therefore refers more to the object of the attraction. Use geil for one’s own state and scharf for evaluating the other person.

Beim Tanzen findet Paul seine Partnerin scharf.
While dancing, Paul finds his partner sexy.
Beim Tanzen merkt Paul, dass er geil wird.
While dancing, Paul realizes that he is getting horny.