means Unable to make a decision, or constantly wavering between choices without committing to any.

from From Latin 'in-' ('not') plus 'decidere' ('to decide'), which itself breaks down to 'de-' ('off') and 'caedere' ('to cut') — so to decide is literally to cut a thing off, to sever your options. The indecisive person, then, is the one who never quite makes the cut. The English word arrived in the 18th century, built on 'decisive,' which had been around a bit longer doing the cleaner work.