This is the 16801st most frequent Russian word.
смертельные
Deadly.
The word 'смертельные' here is used as an adjective describing 'болезни' (diseases), emphasizing their lethality and the threat they pose.
Смертельные болезни представляют большую угрозу для человечества.
Deadly diseases pose a significant threat to humanity.
'Смертельные' serves as an adjective linked to 'ударами' (strikes), illustrating the extreme danger or lethality of these actions in combat.
Он известен своими смертельными ударами в бою.
He is known for his deadly strikes in combat.
In this context, 'смертельные' is an adjective qualifying 'риски' (risks), indicating a serious hazard that can result in death if precautions are not taken.