Acerbic
Sharp or biting, especially in tone or manner.
Ebullient
Cheerful and full of energy.
Pernicious
Having a harmful effect, especially in a gradual or subtle way.
Abstruse
Difficult to understand; obscure.
Exacerbate
To make a problem, situation, or feeling worse.
Ambivalent
Having mixed feelings or contradictory ideas about something.
Ineffable
Too great or extreme to be expressed in words.
Recalcitrant
Stubbornly resistant to authority or control.
Anachronistic
Belonging to a time period other than the one in which it exists, often something outdated.
Inexorable
Impossible to stop or prevent; relentless.
Cacophony
A harsh, discordant mixture of sounds.
Lugubrious
Looking or sounding sad and dismal.
Sycophantic
Behaving in an excessively flattering or insincere way, often to gain favor.
Cadence
The rhythmic flow or pattern of sounds or movements.
Munificent
Very generous; more generous than usual or necessary.
Convoluted
Extremely complex and difficult to follow.
Obfuscate
To deliberately make something unclear or difficult to understand.
Ubiquitous
Present, appearing, or found everywhere.
Disparate
Essentially different in kind; not allowing comparison.
Pusillanimous
Lacking courage or determination; timid.
Ephemeral
Lasting for a very short time.
Perfunctory
Carried out with a minimum of effort or reflection.
Vociferous
Expressing opinions or feelings loudly and forcefully.
Enervate
To weaken or drain of energy.
Recondite
Little known or obscure; requiring special knowledge to understand.