Vine's Expository Dictionary of NT Words 
Matthew 7:22Power. Acts 2:11 Matthew 21:15
King James Dictionary 
Wonderful a. Adapted to excite wonder or admiration exciting surprise strange astonishing. Job 42 .
Webster's Dictionary 
(a.) Adapted to excite wonder or admiration; surprising; strange; astonishing.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
is the rendering in the A.V. at Isaiah 9:6 of the Heb. פֶּלֶא , Piel (Sept. Θαυμαστός ; Vulg. Admirabilis), as an epithet of the Messiah, and designates his incomprehensible character as the God-man.