anodyne (en)

(noun) a painkilling drug or medicine

fractious (en)

difficult to control; unruly; irritable and quarrelsome

indelibly (en)

in a way that cannot be removed or forgotten

internecine (en)

(adjective) marked by slaughter; deadly / (adjective) mutually destructive / (adjective) of, relating to, or involving conflict within a group

lacuna (en)

an unfilled space; a gap (plural: lacunae)

parlous (en)

(adjective) full of danger or uncertainty; precarious

semiotics (en)

the study of signs and symbols and their use or interpretation (adj: semiotic)