Stealthy is a related term of underhand.
As adjectives the difference between stealthy and underhand
is that stealthy is characterized by or resembling stealth or secrecy while underhand is secret; clandestine.
As an adverb underhand is
with an underhand movement.
stealthy
English
Adjective
(er)
Characterized by or resembling stealth or secrecy.
Synonyms
* sneaking
* undercover
* concealed
* See also
Derived terms
* stealthiness
underhand
English
Adjective
(
en adjective)
secret; clandestine
(by extension) dishonest and sneaky; done in a secret or sly manner
thrown (etc.) with the hand brought forward and up from below
Adverb
(
en adverb)
with an underhand movement
in a sly, sneaky or secret manner