effectual
Cross references:
1. effective
ef.fec.tu.al \i-'fek-ch*(-w*)l, -'feksh-w*l\ \i-.fek-ch*-'wal-*t-e-\
\-'fek-ch{-w*)l-n*s, -'feksh-w*l-\ aj : producing or able to produce a
desired effect : ADEQUATE - ef.fec.tu.al.i.ty n
Webster's English Dictionary