advisable
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advisable
Sensible or recommended; something that should be done if possible. The word is often used in formal contexts or as advice, frequently in the form 'tunlichst'.
Es ist tunlich, sich vor einer langen Reise über die Verkehrslage zu informieren.
It is advisable to check the traffic situation before a long trip.
'Tunlich' (advisable) is derived from the verb 'tun' (to do). The ending '-lich' here expresses that something is advisable or good to do. So it means 'what one should do'.
Es ist immer gut, das zu tun, was richtig ist.
It is always good to do what is right.
This word belongs to elevated or formal language, especially officialese. It is rarely used in normal everyday speech.
In amtlichen Schreiben findet man oft eine sehr formelle Sprache.
In official letters, one often finds very formal language.
The adverbial form 'tunlichst' is especially common. It means 'if at all possible' or 'absolutely' and strengthens a recommendation or request.
Sie sollten diesen Fehler tunlichst vermeiden.
You should avoid this mistake if at all possible.
necessary
'notwendig' and 'tunlich' can both say that you should do something. The difference lies in the strength. 'notwendig' means: it has to happen; otherwise something will not work or there will be a problem. 'tunlich' means more: it is advisable or better if you do it. So it is a recommendation, not a firm obligation. Learners may confuse the words because both often appear with rules, plans, or advice. If something is truly needed, 'notwendig' is correct. If something is merely sensible or recommended, 'tunlich' fits better, often in the form 'tunlichst'.
Bei Glatteis sollten wir tunlichst langsam fahren.
On icy roads, we should drive as slowly as possible.
Vor der Operation ist eine genaue Untersuchung notwendig.
Before the operation, a thorough examination is necessary.