lazy, lazines
憜 centers on a lack of effort or energy: laziness or idleness. The given meanings are closely related, with 'lazines' being a variant spelling of laziness.
憜 is a phono-semantic compound with 忄 (heart/mind) and 隋, which likely provides the sound. The exact historical development is uncertain, and the character is rare.
The heart radical 忄 beside 隋 suggests a heart that has fallen into a state of laziness, like someone too idle to move.
For タ, imagine a lazy person saying 'ta' (as in 'ta-da') with no enthusiasm, too lazy to even finish the word.