If you say that something is ~, you mean it makes you feel less worried or unhappy.
My mother had just died and I found the book very ~...
In the midst of his feelings of impotence, a ~ thought arrived.
ADJ
~ly
‘Everything’s under control here,’ her mother said ~ly. ‘You’ve nothing to worry about.’
ADV: usu ADV with v, ADV adj, also ADV with cl