Considering adjectives that start with "T?" The letter "T" has a rich history as a useful letter. The ancient Phoenicians and other tribes used to use the letter "T," which meant "taw" back then, as the marker or signature for people who were illiterate and unable to sign their own names. It originally meant "mark" or "sign" and was only altered to represent our current letter "T" centuries later by the Ancient Greeks. Today, although "T" is no longer a stand-in for a signature, it remains one of the most useful letters in the English language.
The letter "T" has two major sounds in the English language. The first is a nice crisp "t" like in "time." This sound is made by placing the tongue against the top of the teeth and pushing a little bit of air through. When "t" is followed by the letter "h" things get a little more confusing. T can make a sound like thhh- is an "thing" or "th" is in "the." To make the "TH" sound, generally you have to stick your tongue out a little bit through the teeth. Then, to make matters worse, when two T's are combined in the middle of a word, sometimes they can even sound like the letter "D" (like the word "little"). No matter how its pronounced, though, its clear the "T" is a fundamentally important letter in the English language.
Right off the top of your head, it should be easy to think of at least a few adjectives that start with the letter "T." For example, almost everyone is familiar with the expression The Terrible Twos, used to describe the age in which toddlers first begin to assert their independence. While, "terrible" is a "T" adjective describing "twos." There are plenty of famous positive "T" adjectives too- for example, when something is described as "timeless" or "tremendous" those are positive "T" adjective.
There are simply tons of T adjectives in the English language, but here's a list of twenty to get you started. It would be terrific if you were thoughtful enough to think of your own list of T adjectives.