The phrase "monstrous proportions" means that something has grown or become much larger or more excessive than expected, to the point where it seems unnatural or frighteningly huge. Full definition
Occasionally a situation has to reach monstrous proportions before it gets the attention it merits. (treehugger.com)
It is quite honestly a tragedy of monstrous proportions for close to half a billion dollars to have gone down the drain especially in an African country where poverty exacerbated by prolonged drought remains a challenge. (ghanapoliticsonline.com)
Indeed, in the whole country, the malady of corruption was assuming what was at that time described as monstrous proportions with government business being facilitated by the ten percent factor. (ghanapoliticsonline.com)