Without a boom; lacking a booming sound or period of rapid growth; quiet or economically stagnant.
From 'boom' + '-less' (suffix meaning 'without'). The '-less' suffix comes from Old English and is one of the most productive negative suffixes in English, opposite to '-ful.'
'-less' and '-ful' are perfect opposites—'hopeful' vs 'hopeless,' 'peaceful' vs 'peaceless'—and this pairing system helps English-speakers intuitively understand new words even if they've never heard them before!
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