The best replacement for asynchronous is synchronous.

The best alternatives to asynchronous are rated as following:

★★★★★	synchronous
★★★★	synchronous learning
★★★	synchronous replication
★★	synchronous ssd
★★	synchronous communication
★★	synchronous transmission
★★	synchronous adsense
★	synchronous reset
★	synchronous generator
★	synchronous motor
★	synchronous programming
★	synchronous motors
★	synchronous java
★	synchronous javascript
★	ripple counter
★	synchronous e learning
★	synchronous pacing
★	synchronous c#
★	synchronous nand
	synchronous web services
	multithreading
	threading
	traditional google analytics
	synchronous ajax
	nonblocking
	synchronous socket
	synchronous clock
	asynchronous
	synchronous counter
	adaptive usb
	synchronous communications
	synchronous generators
	synchronous dsl
	synchronous cardioversion
	synchronous protocol
	non-blocking
	synchronous ram

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asynchronous

synchronous

synchronous learning