Dr. Mohammad Hossein Hariri Asl 
World-famous World-famous (adj) /ˌwɜːldˈfeɪ.məs/ US /ˌwɝːld-/ known about by most people all over the world – renowned – popular – celebrated: Why didn’t you recognize such a world-famous musician?
Anxious Anxious (adj) /ˈæŋk.ʃəs/ 1. feeling worried and apprehensive – nervous – concerned: He was anxious that he might have failed the exam. 2: being keen and eager to do something – enthusiastic – impatient: Being a new mother, she was most anxious to know the gender of her child. Parts of Speech Noun: anxiety …
Self-conscious Self-conscious (adj) /ˌselfˈkɒn.ʃəs/ US /-ˈkɑːn-/ much too uncomfortable and concerned with your appearance, actions and presence in public places – ill at ease – awkward: Being the only conference member who didn’t have a PhD, I was feeling self-conscious like a fish out of water. Antonyms comfortable, assured
Accustomed Accustomed (adj) /əˈkʌs.təmd/ 1. being familiarized with or habituated to something – familiar: As a miner, he was accustomed to hard labor. 2. ordinary and usual: She’s a writer with her own accustomed writing style. Parts of Speech Verb: accustom Antonyms unaccustomed
Mechanics Mechanics (noun) /məˈkæn.ɪks/ the detailed procedure and mechanism of something that works or functions – mechanism – procedure – workings, process: The mechanics of assembling the components of this machine is far more complex than I expected.
Extol Extol (verb) ɪkˈstəʊl/ US /-ˈstoʊl/ to praise somebody or something excessively – admire – exalt: This book is aimed at extolling the benefits of being a self-employed person. Antonyms condemn, criticize
Internal Internal (adj) /ɪnˈtɜː.nəl/ US /-ˈtɝː-/ occurring or existing inside a person, organization, place, country, object, etc. – intrinsic: He passed away due to intense internal bleeding. Antonyms external, extrinsic
Susceptible Susceptible (adj) /səˈsep.tɪ.bļ/ easily affected or influenced by something – vulnerable – at stake – liable: Stress can undermine your immune system, making your body susceptible to a variety of diseases.
External External (adj) /ɪkˈstɜː.nəl/ US /-ˈstɝː-/ occurring or existing outside a person’s body, country, organization, place, object, etc. extraneous, superficial – extrinsic: The company’s financial success has been undermined by so much external pressure.
Age-old Age-old (adj) /ˈeɪdʒˌəʊld/ US /-ˌoʊld-/ existing for a long period of time – ancient – long-existing: the age-old issue of racial discrimination