very great or very strong; so powerful that you cannot resist it or decide how to react The evidence against him was overwhelming. The overwhelming majority of those present were in favour of the plan. an overwhelming sense of loss She had the almost overwhelming desire to tell him the truth. You may find it somewhat overwhelming at first. There was overwhelming support for our policies.Extra examples The urge to look was almost overwhelming. seemingly overwhelming obstacles She had an almost overwhelming desire to tell him the truth. You may find the whole experience somewhat overwhelming.