a.

1. 不充分的；不适当的；不够格的；不能胜任的[（+to/for）][+to-v]
   His income is inadequate to pay for it.

   他的收入不够支付此事的费用。

   He's inadequate for the job.

   他不能胜任那个工作。

   The supply of water is inadequate for the trip.

   所带的水不够旅途中用。

adj.

1. lacking the quality or quantity required; insufficient.
2. unable to deal with a situation or with life.