The antonyms for the phrase "was obtainable" are words like unattainable, unapproachable, inaccessible, unachievable, impossible, and out of reach. These words refer to something that cannot be obtained or achieved, either due to its nature or due to certain circumstances. For example, a rare and valuable artifact may be unattainable for the average person, while a dream job may be unachievable without the necessary qualifications or experience. On the other hand, something may be inaccessible or out of reach due to physical, geographical, or financial barriers. Regardless of the context, the antonyms for "was obtainable" imply a sense of limitation, challenge, or disappointment.