The best replacement for directional is non directional hypothesis.

The best alternatives to directional are rated as following:

★★★★★	non directional hypothesis
★★★★	non directional tires
★★★	omnidirectional antenna
★★★	non directional
★★★	omnidirectional
★★★	nondirectional hypothesis
★★★	twin snowboard
★★	twin
★	nondirectional tires
★	asymmetric tires
★	unidirectional tires
★	multi directional antennas
★	asymmetric
★	asymmetrical tires
★	non directional tyres
★	directional
★	stabilizing selection
★	asymmetric tyres
★	non-directional tires
★	omni antenna
★	nondirectional
	turn signal
	twin tip
	non-directional hypothesis
	asymmetrical
	twin snowboards
	omni directional
	uni directional
	omnidirectional microphones
	omnidirectional antennas
	non-directional
	nondirectional hypotheses
	omni

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Scale is based on the average worldwide traffic of directional in all years. Click on graph for more.

directional

non directional hypothesis

non directional tires