zutiefst
deeply
To a very high degree; inwardly strong and intense. Used to intensify feelings, opinions, or states.
Wir sind zutiefst erschüttert über die traurige Nachricht.
We are deeply shaken by the sad news.

deeply
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deeply
To a very high degree; inwardly strong and intense. Used to intensify feelings, opinions, or states.
Wir sind zutiefst erschüttert über die traurige Nachricht.
We are deeply shaken by the sad news.

The word is made up of 'zu' (to) and 'tiefst' (deepest), the superlative of 'tief' (deep). It literally means 'to the deepest point' and is used to intensify feelings or convictions.
Ich bin zutiefst davon überzeugt, dass dies die richtige Entscheidung ist.
I am deeply convinced that this is the right decision.
'Zutiefst' (deeply) is almost always combined with adjectives or participles that express strong emotions or a firm attitude. Common combinations are 'zutiefst bedauern' (to deeply regret), 'zutiefst enttäuscht' (deeply disappointed), 'zutiefst beleidigt' (deeply offended), or 'zutiefst dankbar' (deeply grateful).
Sie war zutiefst gekränkt von seinen Worten.
She was deeply hurt by his words.
This adverb belongs to elevated language and is used mainly in formal or written contexts. In everyday colloquial speech, it often sounds very strong or even dramatic.
Der Redner verurteilte die Gewalt zutiefst.
The speaker deeply condemned the violence.
very
'sehr' and 'zutiefst' both intensify a statement. 'sehr' is neutral and fits in almost all everyday situations, for example with qualities, feelings, or actions. 'zutiefst' is much stronger and sounds more serious. It is used especially for inner feelings, firm convictions, or important states. For ordinary things like 'sehr kalt' (very cold) or 'sehr schnell' (very fast), 'zutiefst' usually does not fit. 'zutiefst' means more like: something goes very deep internally.

Nach dem Gespräch war Anna zutiefst enttäuscht.
After the conversation, Anna was deeply disappointed.
Heute Morgen bin ich sehr müde.
This morning I am very tired.