English Hard Words with Meaning:
Challenging Vocabulary:
* Ubiquitous: (adj.) Existing or being everywhere at the same time; very common.
* Ephemeral: (adj.) Lasting for a very short time; fleeting.
* Serendipity: (n.) The occurrence and development of events by chance in a happy or beneficial way.
* Mellifluous: (adj.) Sweet or musical; pleasing to the ear.
* Quixotic: (adj.) Exceedingly idealistic; unrealistic and impractical.
* Obsequious: (adj.) Obedient or attentive to an excessive degree; servile.
* Loquacious: (adj.) Tending to talk a great deal; talkative.
* Fortuitous: (adj.) Happening by chance; accidental.
* Inscrutable: (adj.) Impossible to understand or interpret.
* Fatuous: (adj.) Silly or pointless.
Advanced Vocabulary:
* Circumspect: (adj.) Cautious; wary; prudent.
* Convivial: (adj.) Friendly and lively; sociable.
* Gregarious: (adj.) Fond of company; sociable.
* Prolific: (adj.) Producing a large amount of something; fruitful.
* Precipitous: (adj.) Very steep; dangerously high.
* Ephemeral: (adj.) Lasting for a very short time; fleeting.
* Ubiquitous: (adj.) Existing or being everywhere at the same time; very common.
* Ambivalent: (adj.) Having mixed feelings or contradictory ideas about something or someone.
* Erudite: (adj.) Having or showing great knowledge or learning.
* Perspicacious: (adj.) Having or showing an ability to understand and judge things clearly and intelligently.
Specialized Terms:
* Epistemology: (n.) The theory of knowledge, especially with regard to its methods, validity, and scope.
* Ontology: (n.) The branch of metaphysics dealing with the nature of being.
* Semantics: (n.) The branch of linguistics and logic concerned with meaning.
* Morphology: (n.) The study of the forms of words.
* Syntax: (n.) The arrangement of words and phrases to create well-formed sentences in a language.
Remember: This is just a starting point. There are countless more challenging words in the English language, and the best way to learn them is through reading, listening, and actively using them in your writing and conversations.