Synonym: incapable, incompetent, unfit, unqualified. Antonym: able. Similar words: enable, sustainable, able, cable, table, be able to, tableau, variable. Meaning: [ʌnˈeɪb(ə)l] 
adj. 1. (usually followed by `to') not having the necessary means or skill or know-how 2. (usually followed by `to') lacking necessary physical or mental ability 3. lacking in power or forcefulness.
adj. 1. (usually followed by `to') not having the necessary means or skill or know-how 2. (usually followed by `to') lacking necessary physical or mental ability 3. lacking in power or forcefulness. 
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271. The two countries have been unable to agree which step should come next.
272. The military may feel unable to hand over power to a civilian President next year.
273. He was so angry as to be unable to speak.
274. Children can get frustrated when they are unable to achieve realism in their drawings.
275. We were unable to move because of the density of the crowd.
276. He was unable to make the trip to accept the award.
277. The couple are unable to have children of their own,[http://sentencedict.com/unable.html] but hope to adopt.
278. She will be unable to attend because of a prior engagement.
279. Please let us know if you are unable to attend.
280. Because of a technical hitch, we are unable to bring you the advertised programme.
281. She suffered/had a stroke which left her unable to speak.
282. The hospital is unable to provide the highly specialized care needed by very sick babies.
283. The military government has been unable to win popular support.
284. The illness disabled her and left her unable to study and work.
285. The police have so far been unable to ascertain the cause of the explosion.
286. She seemed to be unable to rouse herself to do anything.
287. Unable to travel, he found some solace in reading about other people's journeys abroad.
More similar words: enable, sustainable, able, cable, table, be able to, tableau, variable, bearable, suitable, reliable, vegetable, disabled, available, comparable, favorable, agreeable, on the table, inevitable, acceptable, changeable, vulnerable, tablespoon, remarkable, uncomfortable, be available, unchangeable, considerable, fortunately, complain about.