| impermeable |
not permitting passage or penetration. |
| impermissible |
not to be permitted; unallowable. |
| impersonal |
without reference or connection to any person. [5 definitions] |
| impersonalize |
to make impersonal. |
| impersonate |
to act or assume the character of; pretend to be (another real or fictitious person or type of person). |
| impertinence |
rudeness or insolence in action or speech. [3 definitions] |
| impertinent |
rude or impudent. [2 definitions] |
| imperturbable |
not easily excited or disturbed; calm. |
| impervious |
not allowing penetration or passage. [3 definitions] |
| impetigo |
an infectious skin disease, esp. among children, marked by pustules that erupt and form thick crusts, esp. on the face. |
| impetuosity |
the state or condition of being impetuous. [2 definitions] |
| impetuous |
sudden and impulsive. [2 definitions] |
| impetus |
something that urges or impels; a driving force. [2 definitions] |
| impiety |
lack of reverence or respect, esp. for what others consider sacred. [2 definitions] |
| impinge |
to strike or collide with something (usu. fol. by on or upon). [3 definitions] |
| impious |
lacking in reverence or respect; irreverent. |
| impish |
of or like an imp, esp. in behavior; mischievous. |
| implacable |
not to be placated or diverted; unappeasable or inexorable. |
| implant |
to plant or embed in something. [3 definitions] |
| implantable |
combined form of implant. |
| implausible |
hard to believe or credit. |