appropriate definition a sneaky, untrustworthy, or insincere person a sneaky, untrustworthy, or insincere person sense #3 appropriate definition http://www.merriam-webster.com/dictionary/weasel a sneaky, untrustworthy, or insincere person http://www.merriam-webster.com/dictionary/weasel sense #3 weasel Weasel: sneaky, untrustworthy or insincere http://www.merriam-webster.com/dictionary/weasel