Underhand

[Sarah]

Done, as pitching, with the hand lower than the shoulder, or,as bowling, with the hand lower than elbow.

[Sarah]

When on a first date, a slightly unattractive women under

[Dianne]

Acting or done in a secret or dishonest way.

[Tanya Shivari]

done secretly, and sometimes dishonestly, in order to achieve an advantage:

[Marquetta]

(of a throw or stroke in sports) made with the arm or hand below shoulder level.