throe
Origin
The noun is probably derived partly: * from Middle English throu, throwe (“(chiefly in the plural) uterine contraction during the birth of a child; pain experienced while giving birth; suffering; a pain; emotional distress, anxiety”) [and other forms], perhaps from: ** Old English þrawu (rare), a variant of þrēa (“affliction, torment; disaster; oppression; a rebuke; severity; threat”), from Proto-West Germanic *þrau, from Proto-Germanic *þrawō (“longing; suffering”), from Proto-Indo-European *trewh₁-; and ** Old English þrōwian (“to endure, suffer”), from Proto-Germanic *þrōwijaną, probably from *þrawō (see above); and ** Old Norse þrá (“longing, yearning”), from Proto-Germanic *þrawō (see above); and * from Middle English throuen (“to endure distress, suffer; to be ill, to have a fever; to suffer (death, hardship, illness, punishment, etc.); to endure (sadness, hard work, etc.)”) [and other forms], from Old English þrōwian (see above). The current spelling of the word is a 16th-century variant of Middle English throu, throwe, perhaps to avoid confusion with throw (“act of turning or twisting; fit of bad temper or peevishness; look of anger, bad temper, irritation, etc., a grimace”
unremitting
Origin
un- + remitting, from remit (in now rare sense of “diminish, abate”), from Middle English remitten, from Latin remittere (“to send, send back”). Compare Old French remettre, remetre, remitter. Not from nonexistent unremit. First attested in 1728.
succour
Origin
The noun is derived from Middle English socour, interpreted as the singular form of socours (“help; encouragement; remedy; protection; helper, protector”), which is from Anglo-Norman socurs, sucurs and Old French secors, secours (modern French secours), from Medieval Latin succursus (participle), from Latin succurrēre (“to run to the help of”), from Latin sub- (“from below”) + Latin currere (“run”). The verb is derived from Middle English socouren (“to help”), from Anglo-Norman socure (compare modern French secourir), also from Latin succurrēre.