Possible to defend

• Logical, as a theory
• Like a rational theory
• Credible number left in Lincoln?
• Defensible points accepted by board
• Sound, as an argument
• That can be held
• A number competent? That’s credible

Wiktionary Word definitions in Wiktionary
a. 1 (context of a theory, argument etc English) capable of being maintained or justified; well-founded 2 (context of a defensive structure English) capable of being defended against assault or attack; defensible

Wikipedia Word definitions in Wikipedia