Agreeableness […] ought to be exact, and adequate both to age, person and condition, avoiding extremities on both sides, being neither too much out, nor in the fashions. Adequate definition: as much or as good as necessary for some requirement or purpose; fully sufficient, suitable, or fit (often followed by to orfor ).. See examples of ADEQUATE used in a sentence. When you want to say that something is enough or good enough for a particular need, use the adjective adequate. You might have an adequate amount of flour for a batch of pancakes, but not a lot extra. If something is adequate, there is enough of it or it is good enough to be used or accepted. One in four people worldwide are without adequate homes. The old methods weren't adequate to meet current needs. The western diet should be perfectly adequate for most people.