know like a book
come home
in tune
get to grips with
understander
know like the back of one's hand
sensitize
enlighten
know from a bar of soap
glom on
practical
know
speak someone's language
skill
get into someone's head
multisense
wrap one's head around
insee
twig
suss out
epistemologically
orient
discern
tumble to
realize
include
get one's arms around
clock
get into
understandingly
intuitable
pertaining
deadeye
empathy
enmind
pellucid
exponent
witness
entertain
revere
human
have someone's number
percipient
overstand
haver
pick up on
conceive
connect the dots
associate
watch like a hawk
meet
take in
intelligible
expert
self-knowledge
manifest
polymodal
have a handle on
perceptualize
grok
stargaze
epistemically
relate
make something of
view
plot
know one's ass from a hole in the ground
in
apprehend
verbalist
illumine
comprehensivity
sure
sentient
perceptible
communalize
instress
turn to
deep thinker
person
metarealist
kevalin
intrapersonal
comprehensible
explorable
respect
quality
inculcate
see past the end of one's nose
shrill
see
devour
intrapsychological
profoundness
learn
conceptualizer
practical
multisense
intuitable
pellucid
human
intelligible
manifest
polymodal
in
sure
sentient
perceptible
intrapersonal
comprehensible
shrill
intrapsychological
epistemologically
understandingly
epistemically
understander
pertaining
deadeye
empathy
exponent
witness
percipient
haver
expert
self-knowledge
view
plot
verbalist
comprehensivity
deep thinker
person
metarealist
kevalin
explorable
quality
profoundness
conceptualizer
know like a book
come home
get to grips with
know like the back of one's hand
sensitize
enlighten
know from a bar of soap
glom on
know
speak someone's language
skill
get into someone's head
wrap one's head around
insee
twig
suss out
orient
discern
tumble to
realize
include
get one's arms around
clock
get into
enmind
entertain
revere
have someone's number
overstand
pick up on
conceive
connect the dots
associate
watch like a hawk
meet
take in
have a handle on
perceptualize
grok
stargaze
relate
make something of
know one's ass from a hole in the ground
apprehend
illumine
communalize
instress
turn to
respect
inculcate
see past the end of one's nose
see
devour
learn
English words for 'To have an extensive and penetrating understanding of (something or someone).'
As you may have noticed, above you will find words for "To have an extensive and penetrating understanding of (something or someone).". Hover the mouse over the word you'd like to know more about to view its definition. Click 
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.
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rejection.
antisocial.
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having nothing to do with
to disgrace oneself
life vest
Not bright
debacle
Not alternative
not prudent or wise
Jew's harp
macropenis
a flood
entertaining
cling film
in every case
squall
morally corrupt
unresponsive.
resolution.
stewardess
not care a bit
To uncover
swish
memorial service
to moisten
hips
familiarity
engraver
depressed
proficiency
magician
status
accomplishment
elevation
means