acrophobia, aerophobia, agoraphobia, ailurophobia, angst, anxiety, apprehension, apprehensive, aquaphobia, arachnophobia, astraphobia, bravado, brazen, chutzpah, concern, concerned, consternation, daunting, disconcerting, eerie, frantic, fraught, frightening, monster, paranoia, perilous, perturbed, phobia, portentous, skittish, spectre, tension, timid, timorous, trepidation, unabashed, unnerving, valiant, xenophobic, zoophobia