A keyword can be confusing if something on the card just sticks out at you and that meaning is in opposition to the keyword. For instance, I did a reading to determine whether I should report a minor crime against me to the police. In the spread I drew the 2 of Cups in the Final Outcome position. (I use the Robin Wood Tarot almost exclusively.) Instead of the usual meaning of this card, the figure above the couple looked to me just exactly like a police badge, and I saw a woman giving something to a man. It's never appeared to be that before or since. A keyword would have just confused what the card was telling me.