They added that most investors were reluctant to take any heavy positions amid concerns about a slowdown in the domestic economy and a pick-up in inflation.
The Kuala Lumpur Composite Index was down 4.88 points to 904.70.
Losers outnumbered gainers 461 to 208, with 300 stocks unchanged and 357 untraded. Volume was 343.36 million shares, worth 769.78 million ringgit (204 million dollars). The ringgit stood at 3.7746 to the US dollar and 4.5040 to the euro.
"Lack of buying incentives led the market lower, as there is little incentives for the buyers at the moment. The market is expected to continue its downward trend and stay under pressure this week," a local brokerage dealer said.
Among blue chips, Tenaga Nasional was down 0.20 ringgit at 10.30, Telekom Malaysia fell 0.15 to 9.95 and Maybank lost 0.10 to 11.30.
National carmaker Proton was down 0.45 at 7.90, as some foreign funds sold the stock on its weaker earnings outlook, dealers said.
Melewar Industrial Group was up 0.01 at 1.26, after announcing that its unit M-Power TT Ltd is buying 55 percent of a 22-million-dollar Thai power generation project, dealers said.
Oilcorp was down 0.04 at 0.70 after gaining earlier on a planned move into Indonesia's oil and gas sector and power generation, dealers said.
Ramunia Holdings was flat at 1.20 despite a report saying that it has won a construction contract worth more than 100 million ringgit from Petronas Carigali, dealers said.