What these suffixes do
The suffixes -ulent and -uous are two related Latin endings meaning "full of" or "having in abundance the quality of". They belong to a cultured, literary register — less common than -ous but producing very high-frequency words in advanced English.
-ulent: turbulent, virulent, succulent, fraudulent, flatulent, corpulent, truculent.
-uous: sensuous, strenuous, ambiguous, continuous, conspicuous, ingenuous, meticulous.
Spanish: almost perfect correspondence: -ulento and -uoso.
The most important words from each group
-ulent (full of / abounding in):
turbulent = full of turbulence (turba = agitation): chaotic, unstable.
virulent = very aggressive, extremely harmful (virus = poison): a virulent strain, a virulent critic.
succulent = juicy, full of liquid (sucus = juice); also a succulent plant.
fraudulent = based on fraud, deceptive.
truculent = aggressively defiant.
-uous (having the quality of):
sensuous = appealing to the senses aesthetically (not necessarily sexual).
strenuous = requiring great physical effort.
ambiguous = having two or more possible meanings.
continuous = without interruption.
conspicuous = clearly visible, standing out.
meticulous = giving extreme attention to detail.
"Sensuous" vs "sensual": a subtle literary distinction
A distinction that marks advanced-level English:
"sensual" = appealing to the senses in a physical, often erotic way. Has sexual connotations.
"sensuous" = delighting the senses in an aesthetic or artistic way, without necessarily implying sexuality.
"a sensuous melody" = one that delights the ear aesthetically.
"sensual pleasure" = physical/erotic pleasure.
Saying "a sensual melody" is not wrong, but "sensuous" is more precise in artistic contexts. This distinction is typical of literary texts and art criticism.
A trick to remember it
-ulent = full of (turbulent, virulent, succulent, fraudulent). -uous = having the quality of (sensuous, strenuous, ambiguous, continuous, conspicuous). Literary level: "sensuous" (aesthetic) vs "sensual" (erotic); "conspicuous" (highly visible). Variant -ulous: meticulous, nebulous, scrupulous.