Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word Sthenebœa could not be parsed. Trying a normal dictionary lookup:
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Sthĕnĕboea or Sthĕnŏboea, ae, f., = Σθενέβοια, Σθενόβοια, daughter of Iobates, king of Lycia, Juv. 10, 327; Hyg. Fab. 57 and 243.
Hence, adj.: Sthĕnĕ-boeïus, a, um, of or belonging to Sthenebœa: heros, i. e. Bellerophon, whom Sthenebœa loved, Sid. Carm. 11, 74.