The app translated it to 'sentirse', and I didn't do it correctly. Just after that I found the error.
'To feel' can be translated to 'sentir' or to 'sentirse' and both are correct depending on the context. 'To feel the wind' would be 'sentir el viento', but 'to feel bad' would be 'sentirse mal'. I conjugated 'sentir' and it was asking for 'sentirse'.
'sentir' is related with outer. You use it to explain that you perceive something that is out of you (like in I feel the wind)
'sentirse' (and other form verbs that fit in "something-something" + se) is related with inner. You use it to explain something about you (i.e your mood). Perceive something inside the limits of your body (like in I feel ill). Is not an exact rule (I feel pain uses sentir for example) but is useful.
Say it to me
V Pronoun Preposition Pronoun
\/ \/
VP PP
Another example, this time from formal Portuguese:
Falar-lhe-ei
Lit: Tell-him-[I will]Such "onewordness" is not universal, though, it's just usage (as you could see "goal keeper" evolving into "goal-keeper" and then just "goalkeeper")
For example, if you insist on requesting "Dímelo", you might say, "¿Me lo dices?", which, by jumping from exhortation to questioning, splits the word. And in general, although "decirse" and "decirlo" might be treated as infinitive, the verb is actually "decir", and no dictionary will treat them as separate verbs.
Always had fun with that one in Spanish class.
While English can fairly be described as a creole it's the influence of Norman French on Old English that makes that a fair description. Old English was IIRC on a dialect continuum between Frisian and Norse.