Integrity Definition

2 Parts to the Definition

[ 1 ] Not two-faced. WYSIWYG

Be true to who you really are to others.

Not nice and friendly on the outside vs. vindictive and mean on the inside

[ 2 ] Commitment. DWYSYWD

Do what you say, Say what you do.

The word Integrity comes from the word Integer which means complete or whole, single. Or, you are the same all the way through.

Integer [L. integer untouched, whole, entire. See {Entire}.]
A complete entity;

Entire
Complete in all parts; undivided; undiminished; whole;