tranquilizingгерундий или причастие настоящего времени Functions as an adjective derived from the present participle of the verb “tranquilize”.
The tranquilizing music helped her fall asleep.
Успокаивающая музыка помогла ей заснуть.
tranquilizingсуществительное Gerund; denotes the act or process of making someone or something tranquil.