We found one dictionary that defines the word sinkiness:

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1. sinkiness: Wiktionary

Definitions from Wiktionary (sinkiness) ▸ noun:  The state of being sinky ▸ Words similar to sinkiness ▸ Usage examples for sinkiness ▸ Idioms related to sinkiness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing sinkiness ▸ Words that often appear near sinkiness ▸ Rhymes of sinkiness ▸ Invented words related to sinkiness