
geradlinig
straight
Running in a straight line, without curves or deviations.
Der Weg führt geradlinig durch den Wald.
The path leads straight through the forest.
straight / straightforward
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straight
Running in a straight line, without curves or deviations.
Der Weg führt geradlinig durch den Wald.
The path leads straight through the forest.

straightforward
In a figurative sense, it describes a person or their behavior as direct, honest, consistent, and without beating around the bush.
Sie ist für ihre geradlinige Art bekannt und sagt immer, was sie denkt.
She is known for her straightforward manner and always says what she thinks.
The word is made up of 'gerade' (straight) and 'Linie' (line). The ending '-ig' turns it into an adjective. Its meaning is therefore literally 'like a straight line'.
Eine geradlinige Form ist leicht zu zeichnen.
A straight shape is easy to draw.
If the word refers to a path, a movement, or a shape, the literal meaning is intended. If it describes a person, their character, or their actions, the figurative, positive meaning 'honest and direct' is intended.
Die Straße verläuft geradlinig bis zum Horizont.
The road runs straight to the horizon.
In the literal meaning, 'geradlinig' (straight) is often combined with words for paths, movements, or shapes. Typical phrases are: 'ein geradliniger Weg' (a straight path), 'eine geradlinige Bewegung' (a straight movement), or 'geradlinig verlaufen' (to run straight).
Der Roboterarm führte eine präzise und geradlinige Bewegung aus.
The robotic arm made a precise and straight movement.
In the figurative meaning, the word often describes people or their qualities. Common combinations are: 'eine geradlinige Person' (a straightforward person), 'ein geradliniger Charakter' (a straightforward character), 'eine geradlinige Haltung' (a straightforward attitude), or 'geradlinig handeln' (to act in a straightforward way).
Er ist für seinen geradlinigen Charakter bekannt.
He is known for his straightforward character.
direct
When describing a person, direkt and geradlinig can both express openness without beating around the bush. Direkt mainly emphasizes immediate, open communication; geradlinig additionally describes consistent and honest behavior. Direkt fits a clear answer, while geradlinig is more suitable for a consistently principled attitude over time.

Sie blieb in den Verhandlungen geradlinig und hielt an ihrer Entscheidung fest.
She remained straightforward during the negotiations and stuck to her decision.
Sie fragte ihren Chef direkt, warum sich der Termin änderte.
She asked her boss directly why the appointment had been changed.