"kalas" in formal Arabic means "run out" , or it means " enough" in slang ,but you should use the verb here as an order not as an adjective or a noun. examples : "kalas al-maa" means run out of water (formal Arabic) or kalas : enough,shut up , stop it, (slang) however in a sentence like" we have enough rice " you can NOT use "kalas" because "enough" here is not an order, instead ,you can use other words like , kafa , yakfi, which means enough too.