noun which may take the genitive case particle 'no', noun
philandering nature; flirtatious disposition
Describes a person's inherent tendency to be unfaithful or flirtatious, often used as a noun or with の to modify another noun.
彼の浮気性には本当に困っている。
I'm really troubled by his philandering nature.
浮気性の人は長続きしない。
People with a flirtatious disposition don't last long in relationships.