1) Dolt is terribly unemotional 2) Emotionless 3) French word used in English 4) Hard to move 5) Having little emotion 6) Impassive 7) Is told off for being dull 8) Not easily aroused 9) Not easily aroused or excited 10) Not exactly manic 11) Stonefaced 12) Unemotional 13) Unexcitable Found on https://www.crosswordclues.com/clue/stolid
Stol'id adjective [ Latin stolidus .] Hopelessly insensible or stupid; not easily aroused or excited; dull; impassive; foolish. Found on http://www.encyclo.co.uk/webster/S/202