adv

• (archaic) Either directly or indirectly preceded or followed by an auxiliary verb, often must: of necessity or need; necessarily, indispensably.
  "As touching corporal puniſhments and penance, as faſting, diſciplin, hare cloth and other chaſtiſements, it behoueth thee herein to vſe good diſcretiõ, taking ſuch as help to repreſſe the aſſaults and temptations of the fleſh, and leuing others that may be hurtful, not yeelding herein to the heats, which ſome nouices are vvont to haue in their beginning, who thorough indiſcrete mortifying, and dompting of their fleſhe, fal into ſome ſuche infirmitie, as aftervvardes they muſt needes pamper and cheriſhe it to much."