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
practical
know
glom on
multisense
skill
speak someone's language
get into someone's head
twig
insee
wrap one's head around
suss out
epistemologically
discern
include
tumble to
realize
orient
get into
intuitable
clock
understandingly
get one's arms around
pertaining
revere
entertain
enmind
exponent
deadeye
have someone's number
witness
pellucid
empathy
human
connect the dots
conceive
overstand
pick up on
haver
associate
percipient
perceptualize
manifest
take in
self-knowledge
meet
polymodal
intelligible
grok
watch like a hawk
have a handle on
expert
make something of
stargaze
plot
view
know one's ass from a hole in the ground
epistemically
relate
deep thinker
verbalist
sure
instress
perceptible
comprehensivity
metarealist
person
sentient
communalize
apprehend
kevalin
in
illumine
turn to
inculcate
comprehensible
intrapersonal
see
quality
respect
see past the end of one's nose
explorable
devour
shrill
conceptualizer
learn
intrapsychological
profoundness
practical
multisense
intuitable
pellucid
human
manifest
polymodal
intelligible
sure
perceptible
sentient
in
comprehensible
intrapersonal
shrill
intrapsychological
epistemologically
understandingly
epistemically
understander
pertaining
exponent
deadeye
witness
empathy
haver
percipient
self-knowledge
expert
plot
view
deep thinker
verbalist
comprehensivity
metarealist
person
kevalin
quality
explorable
conceptualizer
profoundness
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
know
glom on
skill
speak someone's language
get into someone's head
twig
insee
wrap one's head around
suss out
discern
include
tumble to
realize
orient
get into
clock
get one's arms around
revere
entertain
enmind
have someone's number
connect the dots
conceive
overstand
pick up on
associate
perceptualize
take in
meet
grok
watch like a hawk
have a handle on
make something of
stargaze
know one's ass from a hole in the ground
relate
instress
communalize
apprehend
illumine
turn to
inculcate
see
respect
see past the end of one's nose
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 
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faulty.
Not synchronous
when you get right down to it
unbalanced
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blushing
lustful.
to leave as is
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to accompany
meagre
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disgusting