f 4 o 1 o 1 l 1 p 3 r 1 o 1 o 1 f 4
9 letters · 17 points in Scrabble
Meaning
verb proof against human misuse or error
adjective not liable to failure
originEtymology tree English fool English -proof English foolproof From fool + -proof.
Etymology from Wiktionary, CC BY-SA 3.0