suboptimal

American  

[suhb-op-tuh-muhl] / sʌbˈɒp tə məl /

Also suboptimum

adjective

1. being below an optimal level or standard.

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Usage

What does suboptimal mean? Suboptimal means below the optimal (best possible) level or standard.The words optimal and optimum both describe an ideal or perfect level, degree, result, or similar thing. Suboptimal means something has fallen short of that level. It is often used in phrases like suboptimal performance and suboptimal conditions.Example: The patient’s heart is performing at a suboptimal level.

Etymology

Origin of suboptimal

First recorded in 1930–35; sub- + optimal

Example Sentences

"The nuclear signaling pathway it activates then suppresses DC maturation, diminishing the ability of these cells to trigger anti-tumor immunity. This previously unknown mechanism likely contributes to the largely suboptimal performance of DC and other cancer vaccines that has been repeatedly seen in clinical trials."

From Science Daily

It’s just that sometimes it’s optimal to be suboptimal.

From The Wall Street Journal

Relying on yuan appreciation to narrow the trade surplus may be a suboptimal strategy for Beijing, economists say.

From The Wall Street Journal

Appeared in the December 24, 2025, print edition as 'A Perfect Christmas Is Suboptimal'.

From The Wall Street Journal

"Many older adults in suboptimal health often continue to make valuable contributions to those around them," Han said, "and they also may be the ones to especially benefit from being provided with opportunities to help."

From Science Daily

Related Words

• substandard