doubtful Copy link Outline I. In subjective sense; feeling doubt1. dŭbius2. incertusII. Objectively; occasioning doubt1. dŭbius2. incertus3. ambĭguus (esp. of words or facts admitting a two-fold explanation)4. anceps, cĭpĭtis (lit. two-headed; hence, having two aspects or issues) • doubtful: I. In subjective sense; feeling doubt: 1. dŭbius: I am d. what to do, d. sum quid faciam, Hor. (more Ciceron., dubium mihi est, etc.): d. of safety, d. salutis, Ov.: Liv. 2. incertus: v. undecided. Phr.: to be d., dubitare, animi pendere: v. to doubt. II. Objectively; occasioning doubt: 1. dŭbius: a d. victory, d. victoria, Caes.: it is d. which of us two is ..., dubium (est) uter nostrum sit ..., Cic. Join: dubium atque incertum, Cic.; dubium controversumque, Cic. 2. incertus: v. uncertain. 3. ambĭguus (esp. of words or facts admitting a two-fold explanation): of d. disposition (whether likely to be good or bad), ambigui ingenii, Plin.: d. offspring, a. proles, Virg.: to leave d., in ambiguo relinquere, Liv. 4. anceps, cĭpĭtis (lit. two-headed; hence, having two aspects or issues): a d. point of law, jus a., Hor.: to fight a battle of d. issue, ancipiti Marte pugnare, Liv.. d. fidelity, a. fides, Curt. phr.. to leave a matter d., in medio relinquere. v. undecided.