adequate

Definitions:

Equal to; proportionate; fully sufficient.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Fully sufficient for; equal to.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
Sufficient; equal.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (adjective) (adj.) (adjective)
Adequateness.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Equal to: proportionate: sufficient.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
Equal to requirement; sufficient; enough.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Adequately.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)

Usage examples:

But the formula, even in this shape, is not yet entirely adequate for there are those who can not take part in the work of the world, who can only suffer- invalids, e.
- The Moral Instruction of Children by Felix Adler
If the Revolution had been merely political, his judgment would have been adequate
- Burke by John Morley
Not often is a physical instrument found perfect enough to provide it with adequate expression.
- Four Weird Tales by Algernon Blackwood