If you describe a feeling or attitude as ~, you mean that it is strong and firm and does not weaken.
She has been encouraged by the ~ support of her family...
His attitude was ~.
= unswerving
ADJ
If you describe a feeling or attitude as ~, you mean that it is strong and firm and does not weaken.
She has been encouraged by the ~ support of her family...
His attitude was ~.
= unswerving
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012