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Antonyms to shallow include the terms unfathomable and fathomless.
Harmful - Harmless Careful - Careless
The suffix of "fearless" is -Less
" less "
-Less is the suffix.
The suffix for the word harmless is -less, which means without. hope that helps!
The suffix of "restless" is "-less."
Words that are suffix-less are called root words.
Less
Heplful Helpless Useful Useless Careful Careless
less and ness
Thoughtlessness has 2 suffixes-less & - ness.