6 letters · 11 points in Scrabble
adjective lacking bodily or muscular strength or vitality
adjective lacking firmness of will or character or purpose; - Shakespeare
origin* The noun is from Middle English infirme, from Latin infirmus (“weak, feeble”). * The verb is from Latin īnfirmāre, from īnfirmus (“sick, weak, infirm”) + -ō.
Etymology from Wiktionary, CC BY-SA 3.0