behaart
hairy
Covered with hair or grown over with hair. Often refers to body parts of humans or the fur of animals.
Er hat eine stark behaarte Brust.
He has a very hairy chest.

hairy
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hairy
Covered with hair or grown over with hair. Often refers to body parts of humans or the fur of animals.
Er hat eine stark behaarte Brust.
He has a very hairy chest.

The word is derived from the noun 'das Haar' (hair). The prefix 'be-' describes that something is provided with hair. You can remember it as 'covered with hair.'
Seine Arme sind stark behaart.
His arms are very hairy.
When talking about people or animals, 'behaart' (hairy) is often described more precisely with adverbs such as 'stark' (heavily), 'schwach' (lightly), 'dicht' (densely), or 'kaum' (hardly).
Der Hund hat einen dicht behaarten Schwanz.
The dog has a densely hairy tail.
In botany, 'behaart' (hairy) is a technical term used to describe plant surfaces. You can recognize this meaning from the context of leaves, stems, or fruits.
Die Unterseite des Blattes ist weich und behaart.
The underside of the leaf is soft and hairy.
bald / bare
'kahl' and 'behaart' both describe whether there is hair on a certain area or not. 'kahl' means that there is no hair, especially on the head. 'behaart' means that a body part or an animal is covered with hair. So the contrast is clear: 'kahl' means without hair, 'behaart' means with hair. With plants, 'behaart' can also mean fine little hairs, but in the normal contrast with 'kahl', it is usually about body hair or head hair.

Der Hund hat stark behaarte Beine.
The dog has very hairy legs.
Nach der Krankheit war sein Kopf fast ganz kahl.
After the illness, his head was almost completely bald.