Webster’s Revised Unabridged Dictionary · 1913
Obligable
Ob′li·ga·ble (ŏb′lĭ·gȧ·b'l), a. Acknowledging, or complying with, obligation; trustworthy. [R.]
The main difference between people seems to be, that one man can come under obligations on which you can rely, — is obligable; and another is not. Emerson.