One that habitually or excessively is in a specified condition or performs a specified action: drunkard.
suffix forming nouns
indicating a person who does something, esp to excess, or is characterized by a certain quality: braggart; drunkard; dullard.
[via Old French from Germanic -hard (literally: hardy, bold), the final element in many Germanic masculine names, such as Bernhard Bernard, Gerhart Gerard, etc]
a suffix forming nouns that denote persons who regularly engage in an activity, or who are characterized in a certain way, as indicated by the stem; now usu. pejorative: coward; dullard; drunkard; wizard.
[Middle English < Old French, probably extracted from personal names with 2nd element -ard < Frankish *-hart- literally, strong, hardy, hard]