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The antonym of apex would be... nadir? 03:48, 4 August 2008 (UTC)

Certainly not. Nadir is the antonym of zenith, and is rare outside astronomy. Circeus 03:51, 4 August 2008 (UTC)
Yes it would, in nadir's figurative sense (which does refer to a low point). The "low point" sense is hardly rare, there's been recent uses by the Wall Street Journal, Washington Post, Financial Times, and others. --TBC 03:58, 4 August 2008 (UTC)