![to [use] {one's} [head|noodle|naggin]](https://cdn.langeek.co/photo/44770/thumb/180?type=jpeg "to [use] {one's} [head|noodle|naggin]")
to carefully consider the facts of a situation in order to understand something, make a decision, or solve a problem
Ex:
Knowledge & Understanding - Lack of Understanding
Explore English idioms regarding a lack of understanding with examples like "clear as mud" and "make head or tail of".
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out of {one's} depth
[phrase]
in a very nervous or frustrating state of mind in face of a problem or situation one knows very little or nothing about
Ex:
I
'm
out of
my
depth
with
these
complicated
financial
documents
.
your guess is as good as mine
[sentence]
said when one does not have a definite answer to a particular question, similar to the questioner
Ex:
![to [get|have] the wrong end of the stick](https://cdn.langeek.co/photo/44868/thumb/180?type=jpeg "to [get|have] the wrong end of the stick")
to fail to understand or interpret or understand something correctly
Ex:
Do
n't
get
the
wrong
end
of
the
stick
;
I
was
just
joking
.
![to {not} [know] beans about {sth}](https://cdn.langeek.co/photo/44878/thumb/180?type=jpeg "to {not} [know] beans about {sth}")
to {not} [know] beans about {sth}
[phrase]
to have no information regarding a particular subject
Ex:
She
does
n't
know
beans
about
gardening
,
so
she
's
taking
a
gardening
class
to
learn
.
for the life of {sb}
[phrase]
used when one is incapable of understanding or remembering a particular thing
Ex:
She
could
n't
figure out
how
to
use
the
software
for
the
life
of
her
.
closed book
[noun]
someone or something one knows very little or nothing about
Ex:
My
new
neighbor
is
a
closed book
to
me
–
I
do
n't
know
anything
about
them
.
(as|) clear as mud
[phrase]
used to describe something that is complicated due to not being clearly described or shown
Ex:
I
tried
reading
the
legal
contract
,
but
the
language
used
in
it
was
as
clear
as
mud
.
![{not} [know] {one's} ass from {one's} elbow](https://cdn.langeek.co/photo/44844/thumb/180?type=jpeg "{not} [know] {one's} ass from {one's} elbow")
{not} [know] {one's} ass from {one's} elbow
[sentence]
to be incapable of understanding even the simplest concepts
Ex:
Do
n't
ask
him
for
directions
;
he
's
hopeless
with
maps
and
does
n't
know
his
ass
from
his
elbow
when
it
comes to
navigating
.
final frontier
[phrase]
the limits of human knowledge or understanding, representing areas that remain unknown or unexplored
Ex:
In
philosophy
,
the
nature
of
existence
and
consciousness
is
often
considered
the
final
frontier
.
in a fog
[phrase]
confused and unable to think clearly
Ex:
The
sudden
news
left
her
in
a
fog
of
disbelief
and
confusion
.
![to [wrap] {one's} [head|mind|brain] around {sth}](https://cdn.langeek.co/photo/42150/thumb/180?type=jpeg "to [wrap] {one's} [head|mind|brain] around {sth}")
to fully understand something difficult, complicated, or strange
Ex:
![to [make] head or tail (out|) of {sb/sth}](https://cdn.langeek.co/photo/61270/thumb/confusion/180?type=jpeg "to [make] head or tail (out|) of {sb/sth}")
to make an attempt to understand someone or something that is puzzling
Ex:
The
detective
could
n't
make
head
or
tail
out of
the
crime
scene
evidence
.