What other words are similar to incurable, and confusing?

Screwed? Dumbfounded?

Incurable illnesses are often chronic and untreatable.

Things that are confusing can be bewildering, ambiguous, befuddling.

Human?

Incurable is like chronic.

Confusing is like baffling.

Terminal and perplexing.

incurable – irremediable, remediless, immedicable, bootless, hopeless
confusing – dizzy, mazeful, baffling, blinding, dizzying

Incurable
deadly
fatal
hopeless
inoperable
impossible
terminal
cureless
immedicable
irrecoverable
irremediable
irreparable
nowhere to go
out of time
remediless
serious
uncorrectable
unrecoverable

Confusing
baffling
bewildering
complex
complicated
confounding
difficult
disconcerting
perplexing
upsetting
befuddling
blurring
disorienting
involved
mystifying
unsettling

Sick

What other words are similar to incurable, and confusing?(sic)

If I told you I wouldn’t be inscrutable.

I find this question confusing, though hopefully not incurable. What do these two words have in common?

@everyone, @LostInParadise‘s question. “What do these two words have in common”?
But if two or three other words can help me see the common thread that’s why I asked it that way.