Word: underspeed
Part of speech: Noun
Syllables: un
der
speed
Definition: A speed lower than the minimum operating speed.
Morphemes:
Affix: under-
Language: en
PoS: Prefix
Meaning: Under (in any sense): insufficient, insufficiently, below what is correct; subordinate to; beneath or behind.
Affix: speed
Language: en
PoS: Verb
Meaning: To exceed the speed limit.