This is the 11039th most frequent Russian word.
героические
Heroic.
Героические here is used as an adjective to describe remarkable and brave deeds that are inspirational.
Героические подвиги предков вдохновляют нас и сегодня.
The heroic deeds of ancestors still inspire us today.
Героическое in this sentence modifies 'поведение' (behavior), emphasizing bravery and courage in challenging circumstances.
Её героическое поведение в трудной ситуации заслуживает восхищения.
Her heroic behavior in a difficult situation deserves admiration.
Героических here qualifies 'приключениях' (adventures), conveying connotations of excitement and valor.