tenuous - Very weak or slight; lacking strength or substance; an opinion that is not well supported, having little basis or justification.
tenterhooks - Waiting nervously for something to happen.
synergy - The combined power of a group working together that is greater than when they are working separately.
sympathetic - Feeling or showing concern about someone who is in a bad situation
terrifying - Very frightening and causing extreme fear.
tease - To laugh at somebody and make jokes about them, either in a friendly way or in order to annoy them
theoretical - Relating to what is possible or imagined rather than to what is real or known to be true.
tangent - A subject or activity that is a change in direction, and different than the one you had been doing.
tasty - Having a pleasant, distinct flavor that is very appealing.
temperamental - Liable to sudden changes in mood or behavior; unpredictable in temperament.
telltale - Revealing or indicating something hidden or secret, showing the inner nature of something.
thorny - Causing distress, difficulty, or trouble.