submarginal
adjective
sub·mar·gin·al
ˌsəb-ˈmärj-nəl
-ˈmär-jə-nᵊl
1
: adjacent to a margin or a marginal part or structure
submarginal spots on an insect wing
2
: falling below a necessary minimum
submarginal economic conditions
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Merriam-Webster unabridged
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