River bluff?

[boss]

I have been posting a couple of times in the micro section, but have recently been playing 6 max exclusively, so here's my first post

i had no stats on villain but my read at time of the hand was that of a loose-passive. i had sb marked as passive and not too tricky

I doubt I have the best hand at the river. Should I bet nevertheless?

PokerStars 2/4 Hold'em (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with Q[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">2 folds</font>, SB completes, <font color="#CC3333">Hero raises</font>, MP calls, SB calls.

Flop: (6 SB) K[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, SB calls, Hero calls.

Turn: (6 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP bets</font>, SB calls, <font color="#CC3333">Hero raises</font>, MP calls, SB folds.

River: (11 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ?