Adjective
Without a bang (noise or explosion).
Scientists are working on a bangless bomb.
(US) Without bangs (hairstyle).
Source: en.wiktionary.orgIn short what I like to say is that the Big Bang says nothing about what banged, why it banged, or what happened before it banged. It really has no bang in the Big Bang. It is a bangless theory, despite it's name. Alan Guth