undetectable
adjective
[ ʌndɪˈtɛktəb(ə)l ]
• not able to be detected.
• "in the other two patients the antibodies were undetectable after one year"
Similar:
unnoticeable,
imperceptible,
invisible,
inaudible,
odorless,
subtle,
faint,
obscure,
tiny,
minute,
infinitesimal,
