op·por·tun·is·tic 
(ŏp′ər-t-nĭstĭk, -ty-)
(ŏp′ər-t-nĭstĭk, -ty-)adj.
Taking immediate advantage, often unethically, of any circumstance of possible benefit.
- unaccountable
- unaccountably
- unaccounted-for
- unaccredited
- unaccustomed
- unaccustomedly
- unachievable
- unacknowledged
- una corda
- unacquainted
- unaddressed
- unadjusted
- unadorned
- unadulterated
- unadventurous
- unadvertised
- unadvised
- unadvisedly
- unaffected
- unaffectedly
- unaffiliated
- unaffordability
- unaffordable
- unaffordably
- unafraid