hazardous - dangerous, damaging⏎
fickle - changeable, unreliable⏎
elect - choose, vote for, chosen⏎
error - mistake, misjudgment⏎
endorse - support, approve⏎
inoperative - invalid, unusable, powerless, not working⏎
key - most essential, most important, main, chief thing, crucial influential⏎
heads-up - warning, brief update, short report⏎
enable - empower, permit, facilitate⏎
incoming - arriving, received⏎