We don't have synonyms for wryly yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are dryly, wrily and wyly.
"1966: The sins of the father, she thought wryly. Well, they had visited Tony, all right -- only he didn't know it. -- Jacqueline Susann, Valley of the Dolls (Grove Press 1997, p. 206)"
"1966: The sins of the father, she thought wryly. Well, they had visited Tony, all right -- only he didn't know it. -- Jacqueline Susann, Valley of the Dolls (Grove Press 1997, p. 206)"