timorous

The story

1. Proto-Indo-European · derived from*temH-“dark”
2. Latin · derived fromtimor“dread, fear”
3. Medieval Latin · derived fromtimōrōsus
4. Old French · derived fromtemoros
5. Middle English · inherited fromtimorous“(adjective) fearful, frightened; causing fear, dreadful, terrible; deferential, modest; (noun) timid people collectively”
6. English todaytimorous

From Late Middle English timorous (“(adjective) fearful, frightened; causing fear, dreadful, terrible; deferential, modest; (noun) timid people collectively”), borrowed from Old French temoros, temorous, from Medieval Latin timōrōsus, from timōr- (the stem of Latin timor (“dread, fear”)) + -ōsus (suffix meaning ‘full of; prone to’). Timor is derived from timeō (“to be afraid of, fear”) (further origin uncertain, possibly from Proto-Indo-European *temH- (“dark”)) + -or (suffix forming third-declension masculine abstract nouns). Doublet of timoroso.

Words from the same roots