
link
sneaky
Colloquial for deceitful, dishonest, or fraudulent. Describes a person or an action that cannot be trusted.
Das war eine linke Tour von ihm, mich so auszutricksen.
That was a sneaky trick of his, fooling me like that.
sneaky / left
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sneaky
Colloquial for deceitful, dishonest, or fraudulent. Describes a person or an action that cannot be trusted.
Das war eine linke Tour von ihm, mich so auszutricksen.
That was a sneaky trick of his, fooling me like that.

left
An outdated or regional variant for the directional or side indication 'links' (left). Today, the form 'links' is used almost exclusively.
Der linke Handschuh hat ein Loch.
The left glove has a hole in it.
The context makes the meaning clear. If 'link' refers to a person or an action, it means 'sneaky' or 'deceitful'. If it refers to the side of an object, it means 'left'.
Sei vorsichtig, das ist ein linkes Geschäft.
Be careful, that's a shady deal.
The meaning 'sneaky' or 'dishonest' is purely colloquial. This usage is avoided in formal or written contexts.
Er hat versucht, mich mit einem linken Trick hereinzulegen.
He tried to trick me with a sneaky move.
In the colloquial meaning, 'link' is often used in fixed combinations, for example 'eine linke Tour' (a sneaky trick), 'ein linkes Spiel' (a dirty game), or 'ein linkes Ding drehen' (to pull a shady stunt).
Das war ein linkes Spiel von ihm, um den Job zu bekommen.
That was a dirty game on his part to get the job.
The use of 'link' as a directional indication is now outdated or only common in certain regions. In modern German, the form 'links' is almost always used.
In dem alten Gedicht stand: 'Zur linken Hand siehst du den Wald'.
In the old poem it said: 'On your left hand you see the forest.'
mean / common
Link and gemein can both describe an intentionally bad action or hurtful behavior. Link emphasizes that someone is sneaky, dishonest, or difficult to see through; gemein focuses more on maliciousness or causing hurt. Choose link when deception is involved and gemein for openly hurtful behavior.

Es war link, dass er mir absichtlich die falsche Uhrzeit nannte.
It was sneaky of him to deliberately give me the wrong time.
Es war gemein, dass er vor allen anderen über ihre Angst lachte.
It was mean of him to laugh at her fear in front of everyone else.