metuendus: timendus: terribilis: horrendus: horribilis (SYN. in FEARFUL): ☞ formidabilis is foreign to good prose: trux: truculentus (dreadful to behold or to hear; e.g., eyes, looks, words, etc.): immanis (monstrously great; then monstrous in a moral sense): ingens (enormous). A formidable war, bellum formidolosum, atrox: to render one’s self more formidable than powerful, plus timoris quam potentiae sibi addere: to be formidable to anybody, alicui terrori esse; to present anything as formidable, ad timorem aliquid proponere (Cic., ad Div., 2, 16, 4): as very formidable, ad maximum timorem proponere (ibid., 6, 3, 3). Vid: also, FEARFUL.