na-adjective
Describes speech, explanations, or writing that is kept short and to the point. Often used adverbially as 手短に.
See also: 手短い
手短に説明してください。
Please explain briefly.
彼のスピーチは手短だった。
His speech was short.
手短い is an i-adjective with the same meaning, but 手短 is more common as an adjectival noun.
Compound of 手 (te, 'hand') and 短 (mijika, 'short'). The exact derivation is uncertain, but it likely refers to something done quickly or concisely, as if by hand.