Improper is a related term of low.
In obsolete|transitive|lang=en terms the difference between improper and low
is that
improper is (obsolete|transitive) to appropriate; to limit while
low is (obsolete|transitive) to depress; to lower.
As adjectives the difference between improper and low
is that
improper is unsuitable to needs or circumstances; inappropriate; inapt while
low is in a position comparatively close to the ground.
As verbs the difference between improper and low
is that
improper is (obsolete|transitive) to appropriate; to limit while
low is (obsolete|transitive) to depress; to lower or
low can be or
low can be to moo or
low can be (uk|scotland|dialect) to burn; to blaze.
As a noun low is
something that is low; a low point or
low can be (countable|uk|scotland|dialect) a flame; fire; blaze or
low can be , mound, tumulus.
As an adverb low is
close to the ground.