LENSA dan dOt Dot doT

Today I listened to Professor David Crystal's audio tittle "WUSS". I heard it twice and here, there are some new word that I dont't know with their meaning that I would like to share with others.
~ ineffectual>> not producing the effect or result that you want (tidak berjaya)
~ indecisive>> not able to make decisions easily (teragak-agak membuat keputusan)
~ etymology>> the studies of the origins and history of words and their meaning (kajian asal usul)
~ wimp>> a weak person who has no courage or confidence (pengecut)