sanity; soundness of mind; prudence
Almost exclusively used in the negative phrase たわいない (or たわいのない) meaning 'silly', 'trivial', or 'childish'. The standalone noun is rare.
See also: たわいない
His story was silly (lacked sense).
The word たわい is usually used in the form たわいない.
Archaic meaning; not used in modern Japanese.
In classical language, たわい had the meaning of drunkenness.