argumentative
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well-argued
Based on arguments; using a logical and well-reasoned approach. Describes a type of communication or thinking that aims to persuade through reasons.
Sie hat eine sehr argumentative und gut strukturierte Präsentation gehalten.
She gave a very well-argued and well-structured presentation.
Careful: 'argumentativ' (well-argued) can mean the neutral sense of 'well-reasoned' in German. In English, 'argumentative' is almost always negative and means 'quarrelsome' or 'inclined to argue.'
Sein Brief war sehr argumentativ und überzeugend.
His letter was very well-argued and convincing.
The meaning often depends on what is being described. If the word describes a thing (e.g., a text or a speech), it usually means 'well-reasoned.' If it describes a person, it often means 'argumentative' or 'quarrelsome.'
Der Aufsatz war argumentativ sehr stark.
The essay was very strong in terms of argumentation.
The word is derived from the noun 'das Argument' (the argument). The ending '-ativ' forms an adjective and describes a quality or behavior that has to do with arguments.
Eine gute Diskussion braucht eine argumentative Grundlage.
A good discussion needs a well-argued foundation.
The word can also be used as an adverb to describe how an action is carried out. It then usually stands directly with the verb.
Sie hat ihre Meinung argumentativ verteidigt.
She defended her opinion with arguments.
logical
'logisch' and 'argumentativ' can both have to do with reasoned thinking. 'logisch' describes a thought, explanation, or plan as coherent and logical. 'argumentativ' describes more the way something is presented: you work with reasons and arguments in order to persuade someone. Something argumentative should ideally be logical, but 'argumentativ' does not only mean the logic; it also refers to giving reasons in a discussion, text, or presentation. For the result or the internal consistency, 'logisch' fits. For a reasoned way of speaking or writing, 'argumentativ' is more precise.
In der Präsentation erklärt Sofia ihre Meinung argumentativ und nennt mehrere Gründe.
In the presentation, Sofia explains her opinion in a well-argued way and gives several reasons.
Das Team bleibt heute länger im Büro, weil der Plan logisch und gut vorbereitet ist.
The team is staying longer at the office today because the plan is logical and well prepared.