desperate

nouns

a person who is frightened and in need of help
"they prey on the hopes of the desperate"
is derived from
is a type of (narrower)
a person who suffers misfortune

adjectives

arising from or marked by despair or loss of hope
"a despairing view of the world situation"; "the last despairing plea of the condemned criminal"; "a desperate cry for help"; "helpless and desperate--as if at the end of his tether"; "her desperate screams"
desperately determined
"do-or-die revolutionaries"; "a do-or-die conflict"
(of persons) dangerously reckless or violent as from urgency or despair
"a desperate criminal"; "taken hostage of desperate men"
is similar to
involving or causing danger or risk; liable to hurt or harm
"a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
showing extreme courage; especially of actions courageously undertaken in desperation as a last resort
"made a last desperate attempt to reach the climber"; "the desperate gallantry of our naval task forces marked the turning point in the Pacific war"- G.C.Marshall; "they took heroic measures to save his life"
showing extreme urgency or intensity especially because of great need or desire
"felt a desperate urge to confess"; "a desperate need for recognition"
is similar to
requiring attention or action
"as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative"
fraught with extreme danger; nearly hopeless
"a desperate illness"; "on all fronts the Allies were in a desperate situation due to lack of materiel"- G.C.Marshall; "a dire emergency"