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

• Lexulous
• Wordscraper
• Wordosaur

adj. Capable of being understood: an understandable sentence.

adj. Expected or accepted under the circumstances: Their anger is understandable, given what happened.

adj. Capable of being understood; comprehensible

adj. Capable of being accepted or excused under the circumstances

adj. Capable of being understood; intelligible.

That can be understood; capable of being understood; comprehensible; intelligible.

adj. capable of being apprehended or understood

"Gen. Petraeus's use of the word "understandable" may have been used more in the sense of predictable, rather than justifiable."

comprehensible    comprehendible   

incomprehensible   

intelligible    knowable    comprehensible    apprehensible    penetrable    fathomable    interpretable   

expandable    mandible   

comprehensible    intelligible    justifiable    believable    pardonable    predictable    recognizable    legible    practicable    applicable