implausibleness

Noun

uncountable

implausibility; the state or quality of being implausible.

Japanese Meaning

信ぴょう性の欠如 / 説得力のなさ / 信じがたい状態

The implausibleness of her story made even her closest friends doubt what really happened.

彼女の話の信じがたさに、親しい友人でさえ何が本当に起きたのかを疑った。

Sense（1）

implausibility; the state or quality of being implausible.