This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Full of gaps or lacunae.

adj. Furrowed or pitted; having shallow cavities or lacunæ.

Having or full of lacunæ; furrowed or pitted; marked by gaps, cavities, or depressions; specifically, in botany and entomology, having scattered, irregular, broadish, but shallow excavations, as a surface.

"His name appears in a very lacunose papyrus along with the name of Aristoxenus (Aristoxenus, Fr. 22 Wehrli), but it is pure speculation that Aristoxenus labeled him a Pythagorean; Euryphon the Cnidian doctor of the fifth century, who was not a Pythagorean, also appears in the papyrus."

lacunous   

lacuna