Obsolete

fallen into disuse
out of date
antiquated

Astute

having or showing shrewdness and perspicacity an astute observer, astute remarks ; also : crafty , wily

Wow, I would never have thought of the word Perspicacity....I'm not even sure I've ever even heard that word before. But now I know it means astute lol.

Puny

weak
frail
insignificant

I'm about to take a week's holiday, this means you have 48 hours from now to get your answers in!

timeless

enduring
lasting
permanent

Unrequited

not...
returned
reciprocated
repaid
satisfied

Quiescent

dormant
inactive
inert
silent

Awesome!!!!

breathtaking
remarkable
amazing

glam

glamorous
extravagantly showy

Hysterical

1. of, pertaining to, or characterized by hysteria.
2. uncontrollably emotional.
3. irrational from fear, emotion, or an emotional shock.
4. causing hysteria.
5. suffering from or subject to hysteria.
6. causing unrestrained laughter; very funny: Oh, that joke is hysterical!