scatheful
Causing harm or mischief; destructive, injurious.
archaic
For ſhallow draught and bulke vnprizable, With which ſuch ſcathfull grapple did he make, With the moſt noble bottome of our Fleete, That very enuy, and the tongue of loſſe Cride fame and honor on him: What's the matter?
A bawbling Veſſell was he Captaine of,
Where it comes from
From Middle English *scatheful (attested in derivative unnskaþefull) equivalent to scathe + -ful. Cognate with Scots scathfull, scaithful (“harmful, hurtful, injurious, damaging”).
Adapted from the Wiktionary entry scatheful (CC BY-SA 4.0).