Invisible
/ˌɪˈnvɪzəbəl/
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Definition
(adj) Unable to be seen; out of sight; not visible.
Sentence Examples
The moon is invisible behind the clouds.
Methinks my own soul must be a bright invisible green.
CEFR Practice Quiz
Air is ____ to the human eye, but we can feel it when it moves and hear it when the wind blows.