1 although. "he was making headway, albeit rather slowly."

GOOD-LOOKING 
1 – Very good-looking, or beautiful. Can be used to describe people, things, or places. For example, “She is a glorious sight in that dress.” 
HARROWING
1 – painful or distressing
It was a harrowing adventure filled with an unexpected twists, turns, and sacrifices.
HEARTY
1 – an unrestrained expression
I was greeted with a hearty welcome.
2 – wholesome or substantial
I enjoyed the hearty meal.
HERBACEOUS
1 – relating to an herb
Those herbaceous florae were savory.
ISOLATED
1 – alone
He was isolated during the exam.
INTOLERABLE
1 – not tolerable or unbearable
The intolerable noise kept me up all night.
IDYLLIC
1 – picturesque or pleasing
The idyllic Irish landscapes are some of the best in Europe.
IMMENSE
1 – great in size or degree
Our immense Universe is without limits.
INTENSE
1 – extreme degree
The intense amount of work was overbearing.
IRKSOME
1 – irk or tedious
Sometimes we all have to do Irksome tasks.
IMPULSE
1 – prone to act, acting momentarily
To lose weight sometimes we have to deny our impulses for bad food.
INVITING
1 – tempting
The inviting meal made my mouth water.
INNATE
1 – existing in, or belonging to
The innate behavior of a child was to cause trouble.
INDELIBLE
1 – memorable or cannot be washed away or erased.
The indelible landscape means there are hundreds of places to visit in the United States.
INFURIATING
1 – the feeling of extreme anger.
The infuriating delay at the airport made him miss his flight.
IMMACULATE
1 – spotless / extremely clean
Singapore is an immaculately clean country.
2 – having no flaw
The glass in Venice is immaculate.
INTRICATE
1 – having many complex parts
Mona Lisa is an intricate painting. Making it the most famous in the world.
INTERIOR
1 – belonging to the inside,
I great battles happen inside the interior of our minds.
JAUNTY
1 – sprightly
he took a jaunty stroll through the park.
JARRING
1 – having a disorienting effect
The jarring truth is that dreams without goals, remain dreams.
KEEN
1 – ready, or in favor of
I am keen to go to the bar.
2 – sensitive perception
He had a keen nose.
LUNGED
1 – having lungs
The lunged fish swan in the pond.
LIMPID
1 – transparent or clear; Glasslike
The limpid waters in Thailand or famed around the world.
LAVISH
1 – expending or bestowing excess
The lavish palace of Versailles is one of the most popular day trips from Paris.
LUDICROUS
1 – outlandish, or eccentric
Some ludicrous movies aren’t bad.
LASCIVIOUS
1 – filled with desire or lust
She was filled with lascivious thoughts.
LISTLESS
1 – lack of interest, or energy
His listless attitude held him back in life.
LONESOME
1 – sad or lonely
Ah, the lonesome road, has many trails, but many rewards.
MONUMENTAL
1 – highly significant, outstanding
The monumental task can be accomplished by taking little steps every day.
MELANCHOLY
1 – expressing sadness
A melancholy nature will keep you stuck.
MERITORIOUS
1 – deserving reward or praise.
A meritorious life of service.
MEDDLESOME
1 – intrusive or getting involved in
The meddlesome raccoon knocked over the trash can.
MAMMOTH
1 – Huge, exceedingly large
Many of the mammoth caves in the United States are worth visiting.
MODERN-DAY
1 – existing today
Many modern-day advances give our lives ease.
MINOR
1 – inferior in size or degree
The minor problems in life or nothing to sweat over – life is too short.
MISTY
1 – covered by mist.
The heavy air of the misty morning endowed the park with an eerie coolness.
MYSTERIOUS
1 – covered by mystery
The monk has a mysterious nature.
OUT-OF-PLACE
1 – not where it should be
The restaurant felt out of place.
ORNATE
1 – elaborate or excessively decorated
The ornate .ruins draw in visitors.
OUTSTANDING
1 – standing out
His outstanding skills put him in line for a promotion.
2 – unpaid
Outstanding bills can be stressful.
OBTUSE
1 – lack of sharpness
His obtuse answer made no sense.
OBLIVIOUS
1 – lacking remembrance, or memory
Don’t be oblivious to the opportunities that life presents you.
OPULENT
1 – wealth, abundance
The opulent hotel is worth the price tag.
PECULIAR
1 – characteristic of a person
His hot temper was peculiar.
2 – different from the normal
The book had a particular plot twist in the book.
PRISTINE
1 – not spoiled, or corrupted
The pristine beaches had soft sand.
2 – earliest state
The pristine state of the forest
PEACEFUL
1 – a sense of peace
The peaceful forest instilled a peace of tranquility.
PUGNACIOUS
1 – argumentative quarrelsome
He has a pugnacious nature.
PANIC
1 – mental and emotional state of fear
Don’t panic. Breathe and slow down.
PASSABLE
1 – able to be passed
The currents were passable during the low tide.
PIVOTAL
1 – turning, a pivot
Taking my first trip to Ireland was a pivotal moment in my life.
1 – critical
It was a pivotal piece of the puzzle.
POLISHED
1 – polishing, smooth, glossy
Polish your writing before publishing the piece.
POSIED
1 – by or in itself
That’s not the facts per se, but valuable to know.
PLUSH
1 – notably luxurious or rich
His plush life made him soft.
POMPOUS
1 – elevated or arrogant
The pompous rhetoric is hurtful.
2- exhibiting an air of self-importance.
The pompous politician lost sight of his vision.
RIGOROUS
1 – extreme or severe
After rigorous training, he was ready to test himself.