opportunist

From French opportuniste.

opportunist (plural opportunists)

1. Someone who takes advantage of any opportunity to advance their own situation, placing expediency above principle.
   • 2011 November 12, “International friendly: England 1-0 Spain”, in BBC Sport‎:

     James Milner's angled free-kick was headed on to the post by the tireless Bent and Lampard the opportunist was perfectly placed to stoop and head in from virtually on the goal-line.

• chancer

• opportune
• opportunism
• opportunistic
• opportunity

• opportunist in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• opportunist in The Century Dictionary, New York, N.Y.: The Century Co., 1911