FEEBLE

[adjective] -r, -st - weak; without energy, strength or power, or not effective or goodHe was a feeble, helpless old man.The little lamp gave only a feeble light.The opposition to the plan has been rather feeble.Martin told me a really feeble joke.She had another feeble excuse for being late.Someone who is feeble-minded has less than ordinary intelligence or behaves stupidly and without thinking.Some feeble-minded idiot thought it was funny to put salt in the sugar bowl.