just about vs roughly

just about and roughly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
just about	No	No	No	Yes
roughly	No	No	No	Yes

As adverbs, just about and roughly are synonyms defined as:

just about and roughly: (of quantities) imprecise but fairly close to correct

Other synonyms of just about include about, approximately, around, close to, more or less, or so, some.

just about (adverb)	roughly (adverb)
(of quantities) imprecise but fairly close to correct	(of quantities) imprecise but fairly close to correct
	with rough motion as over a rough surface
	with roughness or violence (`rough' is an informal variant for `roughly')