Unafraid means not frightened. Unafraid to speak, wholly unafraid, unafraid of the consequences.
It takes to before a verb and of before a noun, and it is more often praise than description — being unafraid to say something is a compliment about courage rather than a report on somebody's pulse. Note that afraid is itself a past participle, of an old verb meaning to frighten.
1adjectiveunafraidNot frightened.
“The little girl walked straight up to the huge dog, completely unafraid.”
unafraid is a quality of courage.
Proto-Indo-European
*preyH-
Proto-Germanic
*friþuz — peace
Frankish
*friþu — security, peace
Old French
effreer
Anglo-Norman
afrayer — to terrify, disquiet, disturb
Middle English
affrayed
English
afraid
English, today
unafraid
Built from
From un- + afraid. afraid comes from Middle English affrayed, affraied, past participle of afraien (“to affray”), from Anglo-Norman afrayer (“to terrify, disquiet, disturb”), from Old French effreer, esfreer (“to disturb, remove the peace from”), from es + freer, from Frankish friþu (“security, peace”), from Proto-Germanic friþuz (“peace”), from Proto-Germanic frijōną (“to free; to love”), from Proto-Indo-European prāy-, prēy- (“to like, love”). by surface analysis, affray + -ed. Compare also afeard. More at free, friend.
Etymology from Wiktionary, CC BY-SA