dezidiert
decided / explicit
Definite, firm, and unambiguous. Used to especially emphasize an opinion, an attitude, or a statement.
Er hat eine dezidiert andere Meinung zu diesem Thema.
He has a decidedly different opinion on this topic.

decided / explicit
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decided / explicit
Definite, firm, and unambiguous. Used to especially emphasize an opinion, an attitude, or a statement.
Er hat eine dezidiert andere Meinung zu diesem Thema.
He has a decidedly different opinion on this topic.

The word 'dezidiert' (decided/explicit) belongs to elevated written language and is used in formal contexts such as discussions, reports, or academic texts. In normal everyday speech, it often sounds very formal.
Die Expertin vertrat eine dezidierte Position in der Debatte.
The expert represented a decided position in the debate.
'Dezidiert' (decidedly/explicitly) is very often used as an adverb to strengthen a verb or another adjective. It then means something like 'eindeutig' (clearly) or 'ausdrücklich' (explicitly).
Ich bin dezidiert gegen diesen Vorschlag.
I am decidedly against this proposal.
Common combinations are 'eine dezidierte Meinung' (a decided opinion), 'eine dezidierte Haltung' (a firm stance), or verbs such as 'etwas dezidiert ablehnen' (to decidedly reject something) or 'sich dezidiert äußern' (to express oneself clearly).
Der Politiker lehnte den Kompromiss dezidiert ab.
The politician decidedly rejected the compromise.
clear
'klar' and 'dezidiert' can both describe a clear statement. 'klar' mainly means that something is easy to understand and leaves no doubt. 'dezidiert' is more about an attitude or opinion: someone says something firmly and unambiguously. The word sounds rather formal. For simple explanations, 'klar' is more natural; for a strong, deliberately emphasized position, 'dezidiert' fits better.

Im Gespräch lehnt der Chef den Vorschlag dezidiert ab.
In the conversation, the boss firmly rejects the proposal.
Der Techniker hat mir klar erklärt, warum das Gerät nicht funktioniert.
The technician clearly explained to me why the device is not working.