Passiva tantum (‘passive only’) are verbs which do not have an active voice and have a passive aor. (with suffix -ē-/-thē-; Passive (morphology)). Passiva tantum have a mid. (mediopassive) inflection in the pres. and pf. stems (Middle, Mediopassive). In the fut. stem, they may have a mid. (-so-mai) or a passive (-(th)ḗsomai) form, e.g. 1 pres. mid. boúlomai ‘want’, aor. pass. eboulḗthēn, pf. mid. bebo…