The Oxford Thesaurus An A-Z Dictionary of Synonyms INTRO ...

--v. 5 be afraid or scared or fearful or frightened (of),
dread, quail or tremble or quake at, shudder at, shrink from,
quiver: What man cannot understand he often fears. 6 revere,
respect, venerate, be or stand in awe of: If you fear the Lord
as I do, you won't take his name in vain. 7 expect, anticipate,
imagine, suspect, foresee: I fear we are too late for dinner.
fearful adj. 1 afraid, scared, frightened, terrified, alarmed,
panic-stricken, terror-stricken: Of all disasters, I am most
fearful of fire. 2 hesitant, timid, timorous, shy, diffident,
unwilling, intimidated, jumpy, nervous, edgy, panicky, anxious,
apprehensive, cowardly, pusillanimous, Colloq yellow, jittery:
Why is she so fearful of meeting her prospective in-laws? 3
awful, dire, dreadful, frightful, frightening, terrifying,
terrible, appalling, ghastly, atrocious, horrible, horrifying,
horrendous, horrific, hideous, gruesome, grisly, grim, baleful,
monstrous, unspeakable, loathsome, heinous, repugnant,
repulsive, revolting, disgusting, nauseating, nauseous: The
fearful monster blocked our only way out.
fearfully adv. 1 hesitantly, timidly, timorously, shyly, diffidently,
unwillingly, nervously, edgily, anxiously, apprehensively:
Fearfully, she approached the altar. 2 very, awfully, terribly,
extremely, exceedingly, frightfully, tremendously: It was
fearfully considerate of you to come.
fearless adj. brave, bold, intrepid, valorous, dauntless, courageous,
valiant, plucky, daring, audacious, heroic, venturesome,
gallant, chivalrous: These fearless commandos cared nothing for
their personal safety.
fearsome adj. dreadful, awesome, appalling, formidable, daunting,
frightening, frightful, awe-inspiring, menacing, terrible,
terrifying, intimidating: Last week's typhoon was the most
fearsome storm of the century.
feasibility
n. practicability, workability, applicability, viability,
practicality: The feasibility of the scheme has yet to be
assessed.
feasible adj. practicable, workable, doable, applicable, viable,
practical, possible, realizable, achievable, attainable,