obliquely vs sideways

obliquely is not an adjective while sideways is an adjective.

Word	Noun	Adjective	Verb	Adverb
obliquely	No	No	No	Yes
sideways	No	Yes	No	Yes

As adverbs, obliquely and sideways are synonyms defined as:

Other synonyms of obliquely include sidelong.

obliquely (adjective)	sideways (adjective)
	(of movement) at an angle

obliquely (adverb)	sideways (adverb)
at an oblique angle	to, toward or at one side
to, toward or at one side	from the side; obliquely
	with one side forward or to the front
	in a lateral direction