Sie ist eine anständige Tennisspielerin.

English Translation

She’s a decent tennis player.

There are several other adjectives that would have been better translations for what ‘decent’ means here, and none of them imply the moral context of decency that anständige does, which is not what is meant in English by a ‘decent’ player of some sport.

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It is a bit old-fashioned but you really can say that in German (German native speaker here) without any moral implications, so it is indeed a very good translation.
See number two in:

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