1. Infectious.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• infection,
• unfective,
• jnfective,
• knfective,
• onfective,
• 9nfective,
• 8nfective,
• infectuve,
• infecive,
• infectiv,
• infactive,
• infestive,
• inseclike,
• insectlke,
• unobective,
• infictive,
• infecctible,
• infecunde,
• infestuve,
• infestife

• infected,
• infectiously,
• infectious,
• in effect,
• ineffectual,
• infection,
• invasive,
• invest,
• ineffective,
• infest,
• invested,
• invective,
• in fact,
• infested,
• infect,
• investment.

The adjective form of the word "infective" is "infectious".

The plural form of the word "infective" is "infectives".

The singular form of the word "infective" is "infective".