1. comparative form of deadly; more likely to cause death or more dangerous
Usage: comparative degree of the adjective 'deadly'

Examples

• The new virus strain is deathlier than the original variant.
• This weapon is deathlier than the one used in previous conflicts.
• The deathlier of the two diseases has a higher mortality rate.
• Modern toxins are often deathlier in smaller doses than older poisons.
• The deathlier storms this season have caused more damage to coastal communities.