The meaning is similar, but you should use "full of" if you want to be understood.
"Marked by" is okay. "Replete with" is less commonly used. Some readers wouldn't understand it.What do you mean?
Can I use "marked by"?
This is a world marked by inequality.
The world is full of inequality.
I'm not sure what you mean by that sentence. Could you help me with that?
I mean there is inequality everywhere whether it's gender inequality or wealth inequality.
I mean there is inequality everywhere whether it'd be gender equality or wealth equality.
c. Characterized by an abundance of; full of, abounding in.
[. . .]
(b) With with.
1787 Generous Attachm. I. 209 This great world is all too rife with calamity.
1826 E. Irving Babylon I. iv. 253 The very air and atmosphere is rife with delusion.
1852 Ld. Tennyson Ode Wellington vii. 183 Whose life was work, whose language rife With rugged maxims hewn from life.
1878 R. Browning La Saisiaz 43 How rife Life were with delights.
1916 Writer Feb. 36/2 The world is rife with average writers; it is rife with the writer who gladly sells for twenty-five dollars.
1971 P. Goodman Speaking & Lang. ii. vii. 107 The world of words, in which all human beings inevitably live, is rife with delusion.
1990 Connoisseur Sept. 64/4 Sotheby's presents a double session of American Paintings,..rife with opportunities for collectors.
2007 P. Stone Opting Out? 28 Despite being one of the few women on the trading floor when she started out in an industry rife with sexism, Meg managed to rise rapidly in the ranks.
I agree with tedmc that "replete with" has a positive connotation. I prefer "rife with," which has a similar meaning but a negative connotation:
The world is rife with inequality.
From The Oxford English Dictionary (OED):
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