aggressive _adjective 

ADVERBS

highly 
・The man was behaving in a highly aggressive manner.

openly 
・He was not openly aggressive, but I felt uncomfortable with him.

increasingly
・The political candidates are becoming increasingly aggressive towards each other.

overly 
・In zoos, chimpanzees can become overly aggressive if they are bored.

NOUNS

behaviour
・Aggressive behaviour is common among boys of his age.

attitude, approach, manner
・The interviewer seemed to have a very aggressive attitude.

stance, posture
・The union has taken an aggressive stance in the negotiations.

VERBS

become
・The man suddenly became aggressive and started shouting at me.

PREPOSITIONS

to, towards
・Some dogs are aggressive towards children and are not good pets.
・The country was frequently aggressive to its neighbours.