Their innings never fully settled as Bangladesh’s bowlers kept striking at regular intervals.
Captain Paul Stirling top-scored with a brisk 38 off 27 balls, hitting five fours and a six. Tim Tector contributed 17 off 10, while George Dockrell made 19 off 23.
But no other batter could produce a substantial innings as Ireland collapsed from promising starts to a below-par total.
Bangladesh’s spin-pace combination proved too strong. Mustafizur Rahman was outstanding, finishing with 3 for 11 from 3 overs, while leg-spinner Rishad Hossain also claimed 3 wickets for 21.
Shoriful Islam chipped in with 2 for 21, and Mahedi Hasan added a wicket in his tidy spell.
Ireland’s run rate dipped steadily, and they lost their final five wickets for just 24 runs. Craig Young remained unbeaten on 2 as the innings folded one ball short of the full 20 overs.