Correct

恬然

/ tiánrán / 
Strokes

Definition

unperturbed/nonchalant

Example

As an Adjective

unperturbed; not caring in the least

1
Biéren
别人
chūyánbùxùn
出言不逊
  
,
tā
他
tiánránbùyǐwéiguài
恬然不以为怪
  
。

He took no offence at others'insolent remarks.

2
Tiánránzìruò
恬然自若

calm and at ease; nonchalant and composed

3
Chǔ
处
zhī
之
tiánrán
恬然

remain unruffled/unperturbed