unsichtbar
invisible
Not perceptible or visible to the eyes.
Gase wie Sauerstoff oder Stickstoff sind für das menschliche Auge unsichtbar.
Gases like oxygen or nitrogen are invisible to the human eye.

invisible
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invisible
Not perceptible or visible to the eyes.
Gase wie Sauerstoff oder Stickstoff sind für das menschliche Auge unsichtbar.
Gases like oxygen or nitrogen are invisible to the human eye.

The adjective is made up of the prefix 'un-' and the adjective 'sichtbar' (visible). 'Un-' negates the base word, so 'unsichtbar' (invisible) means 'not visible'.
Viele Mikroorganismen sind für das bloße Auge unsichtbar.
Many microorganisms are invisible to the naked eye.
A very common and useful expression is 'sich unsichtbar machen' (to make oneself invisible). This can mean hiding or wanting to remain inconspicuous in a social situation.
In dem Film hat der Held einen Umhang, mit dem er sich unsichtbar machen kann.
In the film, the hero has a cloak with which he can make himself invisible.
The figurative meaning is often used to describe feelings. A clear signal for this is the combination with the verb 'fühlen' (to feel): 'sich unsichtbar fühlen' (to feel invisible) means to feel ignored or unnoticed by others.
Auf der großen Party fühlte er sich klein und unsichtbar.
At the big party, he felt small and invisible.
visible
'sichtbar' and 'unsichtbar' are opposites. 'sichtbar' means that you can see something or that something is clearly recognizable. 'unsichtbar' means that you cannot see something. In a figurative sense, 'unsichtbar' can also mean that someone is not noticed or is overlooked. So the contrast is: something is there and you recognize it, or something is there but you do not see or notice it.

Im Team fühlte sich Maria oft unsichtbar, weil niemand nach ihrer Meinung fragte.
Maria often felt invisible on the team because no one asked for her opinion.
Bei gutem Wetter ist der Turm schon von weitem sichtbar.
In good weather, the tower is visible from far away.