/ ˌəʊvəˈwelmɪŋ; NAmE ˌoʊvərˈw-/ adjective
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.
► over·whelm·ing·ly adverb :
They voted overwhelmingly against the proposal.