Some quarrels:
defenestrate - fenestration, fenestrate, fenestrated, are all "positive" words, adjectives and nouns. The lack of a common word for "throw in through a window" seems to reflect a circumstance - the deed is uncommon. That doesn't seem central.
dejected - jocular is immediate.
disconsolate - consoled is immediate.
impromptu - prompted is immediate
incessant - ceasing, ceased
incognito - recognized
et al.
More quarrels:
Apple #438: Words Without Opposites
Incognito/recognized mentioned, and disconsolate/consoled, and incessant/ceasing
also: "
What lovely Shrinky Dinks! I'm going to fenestrate them so the sun can shine through them." Describing anything as "fenestrated" or even (more technically) as "fenestrate" is standard in some circles (biology, architecture)
"deprive -- to take away from (de "away" + privare "belonging to oneself")" The word he's looking for is "privileged".
Dismantled - maintained is immediate.
Impoverished - provisioned
or reaching a bit:
incorrigible - corraled
indelible - delicate, deliquescent
misnomer - denomination
nondescript - described, describable
nonpareil - paralleled, par
unkempt - kept
unswerving - swerving, swerved
untold - tallied
unruly - ruled
And so forth. That is, we get it, but c'mon.
The commonality in the camouflaged opposites seems to be idiosyncrasy of spelling, or sometimes a vowel shift in the history.