Wry (6)
(Other definitions for ironic that I've seen before include "Strange and perverse" , "Perversely humorous" , "Perversely amusing" , "Using the opposite of the truth for humorous effect" , "Cruelly funny" .)
(Other definitions for rueful that I've seen before include "Penitent" , "Apologetic" , "Regretting" , "Feeling remorse" , "Regretful" .)