worry; care; concern
ennui; boredom
屈託なく話す彼が好きだ。
I like the way he talks without a care in the world.
子どもたちが屈託のない笑顔で遊んでいた。
The children were playing with carefree smiles.
老後への屈託を抱えたまま退職を迎えた。
He reached retirement still weighed down by worries about old age.