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Webster 1913 Edition

adv.

Meagerly; without fat or plumpness.

adv.

Meagerly; without fat or plumpness.

leanly ‎(comparative more leanly, superlative most leanly)

In a lean way.
- 2008 June 29, Andrew E. Kramer, “Athletes Disabled by Wars Lead Iraqi Team in World Games”, in New York Times:
  Faraj Hasab Khudhair, Iraq’s star wheelchair fencer, lost a leg below the knee to a mortar shell in 1986. Mr. Khudhair, a fit, leanly muscled 41-year-old, said he ventured out during United States airstrikes in his Diyala Bridge neighborhood of Baghdad to get to training sessions.