The Collaborative International Dictionary of English v.0.48:

Businesslike \Busi"ness*like`\ (b[i^]z"n[e^]s*l[imac]k`), a.
   In the manner of one transacting business wisely and by right
   methods; practical and efficient.
   [1913 Webster]

   2. serious and purposeful.
      [PJC]

WordNet (r) 3.0 (2006):

businesslike
    adj 1: exhibiting methodical and systematic characteristics that
           would be useful in business
    2: not distracted by anything unrelated to the goal [syn:
       businesslike, earnest]