
anspruchsvoll
demanding
Setting high requirements and therefore difficult, complex, or time-consuming. It can refer to tasks, works, or situations.
Das Studium der Physik ist sehr anspruchsvoll.
Studying physics is very demanding.
demanding
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demanding
Setting high requirements and therefore difficult, complex, or time-consuming. It can refer to tasks, works, or situations.
Das Studium der Physik ist sehr anspruchsvoll.
Studying physics is very demanding.

demanding
Describing a person who has high expectations regarding quality, performance, or other people's behavior.
Er ist ein anspruchsvoller Gast, dem man es nur schwer recht machen kann.
He is a demanding guest who is hard to please.
The word is made up of 'Anspruch' (claim, demand, expectation) and '-voll' (-ful). So it literally means 'full of demands' or 'full of requirements,' which makes both meanings easier to understand.
Ein Marathonlauf ist eine sehr anspruchsvolle sportliche Leistung.
Running a marathon is a very demanding athletic achievement.
The meaning depends on what the adjective refers to. If it describes a thing or task, it means 'difficult' or 'complex.' If it describes a person, it means that this person has high expectations.
Dieses Computerspiel ist sehr anspruchsvoll und nichts für Anfänger.
This computer game is very demanding and not for beginners.
When something is difficult, 'anspruchsvoll' (demanding) is often combined with nouns such as 'Aufgabe' (task), 'Job' (job), 'Text' (text), 'Studium' (degree program/studies), or 'Training' (training).
Er hat einen sehr anspruchsvollen Job in der IT-Branche.
He has a very demanding job in the IT industry.
To describe a person with high expectations, 'anspruchsvoll' (demanding) is often used in combinations such as 'anspruchsvoller Kunde' (demanding customer), 'anspruchsvoller Chef' (demanding boss), or 'anspruchsvoller Geschmack' (refined/demanding taste).
Unser neuer Chef ist sehr anspruchsvoll, aber fair.
Our new boss is very demanding but fair.
heavy / difficult
Schwer and anspruchsvoll can both describe a task with high demands. Schwer mainly emphasizes that it is difficult to manage. Anspruchsvoll can additionally highlight in a positive way that it is complex and requires a high level of ability.

Das Klavierstück ist anspruchsvoll und verlangt auch von erfahrenen Musikern viel Können.
The piano piece is demanding and requires a great deal of skill even from experienced musicians.
Das Klavierstück ist für Anfänger schwer zu spielen.
The piano piece is difficult for beginners to play.