deep-laid

from WordNet (r) 3.0 (2006)

deep-laid
    adj 1: secretly and carefully planned; "deep-laid plans"

from The Collaborative International Dictionary of English v.0.48

Deep-laid \Deep"-laid`\, a.
   Laid deeply; formed with cunning and sagacity; secretly and
   carefully planned; as, deep-laid plans.
   [1913 Webster + WordNet 1.5]