unerfahren
inexperienced
Having little or no experience or knowledge in a specific area or in life in general.
Als unerfahrener Koch hielt er sich genau an das Rezept.
As an inexperienced cook, he followed the recipe exactly.

inexperienced
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inexperienced
Having little or no experience or knowledge in a specific area or in life in general.
Als unerfahrener Koch hielt er sich genau an das Rezept.
As an inexperienced cook, he followed the recipe exactly.

The word consists of the prefix 'un-', which expresses negation, and the adjective 'erfahren' (experienced). So it is the direct opposite of 'erfahren' (experienced).
Der junge Arzt war noch unerfahren, aber sehr motiviert.
The young doctor was still inexperienced, but very motivated.
To name the area in which someone has no experience, you use the preposition 'in' followed by the dative. The pattern is: unerfahren in etwas sein.
Ich bin noch sehr unerfahren im Umgang mit dieser neuen Software.
I am still very inexperienced in using this new software.
'Unerfahren' (inexperienced) is often used to describe people in a specific role. Typical examples are 'ein unerfahrener Fahrer' (an inexperienced driver), 'eine unerfahrene Mitarbeiterin' (an inexperienced employee), or 'ein unerfahrener Anfänger' (an inexperienced beginner).
Als unerfahrener Reisender hat er einige typische Fehler gemacht.
As an inexperienced traveler, he made a few typical mistakes.
green
'grün' and 'unerfahren' can both describe that someone has little experience in an area. 'unerfahren' is direct and neutral: it clearly says that someone has not done something often yet. 'grün' is more figurative and more colloquial. It fits especially when someone is new to a job, task, or situation. Learners may confuse the words because the meaning is similar. In factual situations, 'unerfahren' is usually more precise; in casual conversations, 'grün' can sound more natural.

Vor dem ersten Termin wirkt die junge Ärztin noch etwas unerfahren.
Before the first appointment, the young doctor still seems a little inexperienced.
Im Supermarkt ist der neue Mitarbeiter noch grün und braucht Hilfe an der Kasse.
At the supermarket, the new employee is still green and needs help at the checkout.