Volume 1, Book 2 ‘Belief’, Number 33:
Narrated by ‘Abdullah bin ‘Amr: The Prophet said, “Whoever has the following four (characteristics) will be a pure hypocrite and whoever has one of the following four characteristics will have one characteristic of hypocrisy unless and until he gives it up.
1. Whenever he is entrusted, he betrays.
2. Whenever he speaks, he tells a lie.
3. Whenever he makes a covenant, he proves treacherous.
4. Whenever he quarrels, he behaves in a very imprudent, evil and insulting manner.”
copy-pasted from http://www.sahih-bukhari.com
Entrusted: hand over, trusted, assigned.
Betray: let down, deceive, give up.
Covenant: agreement, contract, promise.
Treacherous: double crossing, unfaithful, disloyal.
Imprudent: irresponsible, rash, unwise, thoughtless.