haitalliset
Haitalliset is a Finnish adjective meaning harmful or detrimental. It is formed from the noun haitta, meaning harm or nuisance, with the common adjectival suffix -llinen, giving haitallinen for the singular and haitalliset for the nominative plural. In Finnish, adjectives agree with the noun in number and case, so haitallinen becomes haitalliset when describing plural nouns, for example haitallinen vaikutus (a harmful effect) and haitalliset vaikutukset (harmful effects).
The term is widely used in health, safety, and environmental contexts. Common phrases include haitalliset aineet
Nuance and relation to other terms: haitallinen contrasts with vaarallinen. While vaarallinen typically signals immediate danger
See also: haitta, haitallisuus, haitallinen. The term is part of general Finnish descriptive vocabulary and is