bristlinggerund / present participle Functions as an adjective formed from the present participle of ‘bristle’.
His bristling attitude made it difficult to approach him.
Его ершистое отношение затрудняло к нему подход.
The bristling hedgehog curled up into a ball.
Щетинистый ёжик свернулся в клубок.
Gerund form functioning as an uncountable noun.